M15A4 C.Q.B Compact Seal (Classic Army)

Price: Rp 5.775.000
Weight: 0

Rail System Flip-Up Rear Sight Real ARMALITE Logo Modified Wiring Switch Individual Serial Number Hi Cap Magazine (300 Rd) Steel Detachable Front Sight Easy Disassembly Metal Body 7mm Bearing Metal & New Design Gear Box Bearing Spring Guide and Piston Head Reinforced Parts (Gear Set and Sealed Cylinder) Battery and charger are not included

Browning M1921 M2 M2HB M2B-QCB heavy machine gun (USA)

John Browning testing his prototype .50 caliber heavy machine gun, circa 1919

Twin AA mount with Browning M2 water-cooled machine guns in action

Browning M2HB air-cooled machine gun on M3 tripod

Browning M2HB-QCB air-cooled machine gun of current manufacture with quick-change barrel, on M3 tripod

Caliber: .50BMG (12,7x99mm)
Weight: 38 kg MG, 58 kg complete with M3 tripod
Length: 1650 mm
Length of barrel: 1140 mm
Feeding: belt
Rate of fire: 450-600 rounds/min

The development of a large-caliber heavy machine gun in USA was initiated in 1918, at the direct request of General Pershing, the commander of the US expeditionary corps in Europe. He requested a heavy gun capable of destroying military aircraft and ground targets such as tanks and armored cars. The task of developing such a gun and ammunition was passed to John Browning (then based at Colt’s factory) and the Winchester Arms Co. respectively. The basic pattern of the new heavy machine gun was sealed in 1921. Officially adopted in 1923 as “machine gun, .50 calibre, M1921”, this water cooled, belt fed gun became the prime AA weapon for the infantry and the navy.
In the year 1930 US Army adopted a slightly modified .50 caliber M1921A1 machine gun, and further work on this gun concentrated on the development of a universal weapon suitable for most roles. The key design changes were made by Dr. Samuel G. Green, who redesigned the basic receiver so it could be used in conjunction with either water-cooled or air-cooled barrels, encased in a water jacket or short perforated sleeve respectively. He also developed a switchable left or right side belt-feeding unit. The US Army adopted the new, improved fifty-caliber machine gun as the M2, in a water-cooled anti-aircraft version, an air-cooled ground mount version and as an aircraft weapon. Since the original air-cooled barrels were too light to provide any degree of sustained fire in ground applications, heavier barrels were soon introduced for the ground-mounted guns, so this weapon became the “M2 Heavy Barrel” or M2HB for short. In 1938 the barrel of the M2HB was lengthened to provide more striking energy and longer range, and in this form the M2HB was made in great numbers during the Second World War. US arms factories turned out a little less than 2 million M2 guns in all versions between 1941 and 1945, of which over 400,000 were made in M2HB configuration for ground use.
After the WW2, .50-caliber Browning guns found a wide acceptance across the world, and today are still widely used as ground and vehicle guns in most of NATO countries and many others. Production of new M2HB guns is continued in USA and Belgium.

Browning M2HB machine gun is belt-fed, air-cooled machine weapon capable of semi-automatic and automatic fire. The M2HB fires from a closed bolt at all times, and uses a short-recoil operated action with a vertically sliding locking block, which rises up to lock the bolt to the barrel extension, and drops down on recoil to unlock the bolt from the barrel. It also has a bolt accelerator, made in the form of a lever located at the bottom of the receiver. Upon recoil, once the barrel is unlocked from the bolt, it strikes the accelerator, so the kinetic energy of the recoiling barrel is quickly transmitted to the bolt, improving the reliability of the weapon. Barrels are screwed into the barrel extension and are not quick-detachable on standard M2HB weapons; furthermore, once the barrel is installed in the weapon, the headspace must be adjusted prior to firing, or the weapon may fail to fire or produce a serious jam. However, quick change barrel (QCB) kits were developed by several companies during the 1970s and 1980s, and every M2HB weapon can be converted to a QCB version with the replacement of only a few parts, including the barrel. The rear part of the barrel is enclosed in a short, tubular, barrel jacket with cooling slots. The back of the receiver houses a bolt buffer, and additional buffer is used to soften the movement of the heavy barrel. On infantry guns, the cocking handle was invariably installed on the right side of the weapon, but slots were made on both sides of the receiver for tank installations which may require a left-side cocking handle.
Browning M2HB machine guns use a disintegrating steel belt, with the feed switchable from one side to the other through the re-installation of certain parts in the feed unit. The belt feed is of the two stage type – every cartridge is first withdrawn from the belt toward the rear by the pivoting extractor lever, attached to the bolt. Once the cartridge is clear of the belt, it is lowered into a T-slot cut into the bolt face, and pushed forward into the barrel. Spent cartridge cases are forced down the T-slot and out of the weapon through an opening at the bottom of the receiver by the following cartridges, or by the pivoting belt extractor lever (for the last cartridge case). A rotary switch is used to select the track for left or right side feed.
Since the gun fires from a closed bolt, it has a separate firing pin, powered by its own spring, and hosted inside the bolt along with the sear and cocking lever. Upon the recoil stroke of the bolt, the cocking lever pulls the firing pin back until it is engaged by the sear. Once the bolt is fully in battery (locked closed), a pull on the trigger raises the trigger bar so it acts on the sear and releases the firing pin. The standard firing controls consist of a push-type thumb trigger and sear release buttons located between the dual spade grips. Alternatively, an electric solenoid trigger can be installed for mounted vehicle applications. The M2HB has an unusual method of providing semi-automatic fire (probably added to the basic design as an afterthought) – it has a bolt latch, which locks the bolt to the bolt buffer in the open position after each shot. Therefore, if gun is fired in semi-automatic mode (single shots), for each shot the operator must first release the bolt forward by pressing the bolt latch release, located next to the thumb trigger (as the gun fires from a closed bolt). After the bolt is released and the gun is loaded, the operator may push the trigger to fire a single bullet. If the automatic mode is desired, the bolt latch must be turned off and locked by turning its lock to the left. In this position it will not engage the bolt and the gun will fire continuously as long as the trigger is pressed. It must be noted that original M2HB guns had no manual safeties; however, the recent M2E2 upgrade, developed by General Dynamics, includes, among other items, an additional manual safety located next to the trigger.
Standard sights consist of a folding blade front and frame-type rear. The rear sight is mounted on the receiver, the front sight is located at the front of the receiver and protected by an arc-shaped sight protector. Additionally, various types of telescopic and night sights can be installed using appropriate mountings.

XM307 ACSW Advanced Crew-Served Weapon / automatic grenade launcher (USA)

XM307 ACSW grenade launcher, front view Image: GDATP XM307 ACSW grenade launcher, rear view Image: PEO Soldier, US Army XM307 ACSW grenade launcher on field trials Image: PEO Soldier, US Army Caliber: 25x59mm Type: gas operated, belt fed automatic grenade launcher Overall length: 1328 mm Weight: 22.7 kg complete with tripod mount and sight / fire control unit Effective range: up to 2000 m against point targets, 3600 m maximum Rate of fire: 250 rounds per minute The origins of the XM307 Advanced Crew Served Weapon (ACSW), also known as XM307 25mm Airbursting Weapon System, lie in the several military documents, published in USA during late 1980s. These documents stated that current small arms have reached its peak in development, and the only currently possible way to increase combat effectiveness and single-shot lethality of such weapons is do develop new guns that will fire air-bursting munitions with programmable fuses. Following these conclusions, US Army initiated development of several so-called Objective weapons; two most famous of these were XM29 Objective Individual Combat Weapon (OICW) and XM307 Objective Crew-Served Weapon (OCSW), currently renamed to Advanced Crew-Served Weapon (ACSW). After much development, the prime contractor for ACSW program was selected as General Dynamics Armament and Technical Products (GDATP). The development team for ACSW also includes General Dynamics Ordnance and Tactical Systems (air-bursting ammunition), Kaman Dayron Inc (programmable fuze) and Raytheon (computerized fire control system). First demonstrated in around 1999 as 25mm OCSW, at the present time (early 2006) the XM307 ACSW is on advanced stages of development, with several prototypes already tested with live ammunition, including air-bursting rounds. Initial plans called for first US Army units to be equipped with 25mm M307 ACSW weapons by 2008; M307 shall replace in service the older weapons like Mk.19 Mod.3 40mm grenade launchers and .50 caliber M2HB machine guns. For added versatility, XM307 can be easily converted to fire .50 caliber machinegun ammunition (12.7x99) with replacement of just 5 parts. The key to greatly increased combat effectiveness of ACSW system is programmable air-bursting ammunition, which will be used in conjunction with electronic fire control unit. This ammunition will allow to precisely engage enemy personnel in open or in defilade, without the need for direct impact in the target area. Other types of ammunition proposed for XM307 ACSW are HEAT (with required armor penetration up to 5cm / 2in), less-lethal (with tear gas for peace-keeping applications) and training rounds with dummy warheads. It is obvious that by the year 2008 the XM307 will enter into strong competition with several 40mm air-bursting weapons such as Mk.47 Striker 40, and the outcome of this competition is hardly predictable, as either system has its own merits and downsizes. ACSW is certainly lighter, fires lighter ammunition (allowing to carry more ammo in the same weight), and has longer range. 40mm weapons fire bigger warheads and can use huge stocks of already existing and well developed NATO-standard ammunition of various types, including point-detonating FRAG, HEDP, AP, less-lethal and many others. XM307 Advanced Crew Served Weapon is gas operated, rotating bolt locked weapon that uses differential recoil system for decreased peak recoil. XM307 is belt fed weapon that fires from open bolt. The differential recoil system means that barrel and bolt group are allowed to recoil within the receiver casing together, against the recoil springs. When weapon is cocked for first shot, bolt is locked open and the entire barrel/bolt group is carried rearwards and also locked there. Upon the pull of the trigger both barrel group and the bolt inside it are released, and the bolt loads the round and locks it in chamber while barrel still moves forward; firing pin is then released immediately, and the recoil from the discharge first has to arrest the forward movement of the barrel group, and then throws it backward with less force than it would in the traditional system with fixed barrel. The belt feed and bolt cycling are operated by conventional gas action. The fire control unit includes zoomable day and night vision channels that output the sight picture to the small display at the rear of the sight. Integral laser range-finder allows for precise range measurement, necessary for automatic point of aim correction and for programming of the air-bursting fuzes. XM307 weapon is fitted with dual, ergonomically shaped spade grips with triggers and fire and sight control buttons. Additional buttons are located at the rear of the sight / fire control unit, below the eyepiece. In standard applications, XM307 can be used either on lightweight infantry tripod, or on vehicle mounts, manually or remotely controlled. For vehicular applications, GDATP will develop the dual feed option, which will allow to select the type of ammunition (anti-personnel HEAB or armour-piercing) at the instant before firing. --

GD LW50MG lightweight .50 caliber machine gun (USA)

Caliber	.50 BMG / 12.7x99
Weight	18 kg (40 lbs) gun + 10 kg (~22lbs) tripod
Length	1562 mm (61.5")
Barrel length	n/a
Feed	belt
Rate of fire	260 rounds per minute

The LW50MG (Lightweight .50 caliber Machine Gun) is the new product of the Armament and Technical products branch of the US-based General Dynamics corporation. This weapon is a direct offspring of the marginally successful XM-307 ACSW / XM-312 program, and current plans are to field first production units of the LW50MG in around 2011. The first US military units to get this highly mobile infantry support weapon are Airborne, Mountain and Special Operations (SOCOM) troops. The primary role of the LW50MG is to augment venerable but overly heavy .50 caliber Browning M2HB machine guns in mobile units. The LW50Mg can provide effective means to combat vehicles (including lightly armored ones), enemy snipers, infantry behind typical urban covers etc.

The design of the LW50MG is based on the recoil-reducing action, developed for 25mm XM-307 ACSW grenade launcher. The barrel is locked by the conventional rotating bolt, which, in turn, is operated by more or less conventional gas system. The bolt group moves within the barrel extension, which, along with the barrel and gas system, can recoil inside the gun housing. The LW50MG fires from the open bolt, and at the moment of fire the recoiling group (barrel, barrel extension, gas system and gas drive) is in its rearmost position, resting against the spring. When trigger is pulled to fire the gun, the barrel group first is released to slam forward. as soon as its acceleration results in sufficient kinetic energy / inertia build-up, the sear is released and the cartridge is fired while barrel/bolt group is still moving forward. Therefore the recoil of the discharge first had to overcome the inertia of the recoiling group, and only then group began to recoil back, compressing the return spring. At the same time gas drive unlocks the bolt, and retracts it within the barrel extension, extracting and ejecting a fired case. This somewhat complicated design results in significantly reduced peak recoil, which allows to lighten both the gun and the mount. The price of this reduction in recoil is complicated (and expensive) construction and low cyclic rate of fire. The feed is using standard .50 caliber metallic belts, from left side only. Current prototypes of LW50MG are fitted with dual spade grips with thumb trigger in between, and installed on special lightweight tripods. Guns are fitted with Picatinny rails on the housing to permit installation of the various sighting and target illuminating / pointing devices and equipment.

Armalite AR-10 (USA)

the original AR-10 of the late 1950s. Note the three-prong flash hider and a bayonet lug under the barrel

the AR-10B rifle, a modern "civilian" re-creation of the AR-10. Note the lack of the bayonet lug and the M16A2-type rear sight and pistol grip

AR-10A2 is, basically, an upscaled AR-15A2 rifle, chambered for the .308 Winchester (7.62x51mm) cartridge. Note that the charging handle is above the buttstock, as on AR-15 / M16 rifles. The furniture is similar to the M16A2 rifle, except for the muzzle brake

AR-10(T) - a target grade version of the "new" AR-10, with Picatinny-type rail instead of the carrying handle, and the match barrel

The original AR-10, partially field-stripped. The similarity to the latter AR-15 / M16 rifles is obvious

Caliber: 7,62mm NATO (7.62x51mm)
Action: Gas operated, rotating bolt
Length : 1016 mm
Barrel Length: 508 mm
Weight: 4.31 kg empty, without magazine and sling
Magazine: 20 rounds
Rate of fire: 700 rounds per minute (original military version)

The AR-10 rifle, designed by the Eugene Stoner at the Armalite division of the Fairchild Engine and Airplane Corp, seen no significant success at the time it had been introduced, but it still had some historical significance since the AR-10 served as a basis for the further development of the much more successful AR-15 / M16 series rifles. Basically, earliest AR-15 prototypes were no more than a scaled-down AR-10. The AR-10 was intended for the US Army trials for a new battle rifle, to replace the venerable M1 Garand. AR-10, with the first prototype built in 1955, came too late for these trials, and was too unconventional for conservative minds in the US Army, and consequently lost the trials to the T44 rifle, which was adopted in the 1957 as the M14. The AR-10 was ready for mass production by the 1960, but very few were made in USA. A manufacturing license had been sold to the Dutch company Artillerie Inrichtingen. Only Sudan and the Portugal apparently bought some AR-10 rifles for their military, and the production of the AR-10 had been ceased in the early or mid-1960s, with only about 10 000 military AR-10 being ever made.

Some two or three decades later, the reorganized Armalite company brought the modified AR-10 rifle back to civilian and police markets. Unlike the original AR-10, the new AR-10B is a semi-automatic only rifle, and it is available in four basic versions. The AR-10B itself is more or less a copy of the original AR-10, with the similar brown plastic furniture and short buttstock, and with the trigger-like charging handle under the carrying handle. The other three models look more like the scaled up M16A2 derivatives, with the same A2-style furniture, sights, and M16-type charging handles. The AR-10A2 has all the A2 furniture and options, while the AR-10A4 has the "flat-top" style receiver with the Picatinny rail instead of the carrying handle. The AR-10(T) is a target grade rifle, with match barrel and trigger and A4-type flat-top receiver.

Technically, the AR-10 differs very little from its direct derivative, the AR-15/M16, so for a complete description please refer to the AR-15 / M16 article on this site.

Z-M Weapons LR-300 assault rifle / Para USA Tactical Target Rifle (USA)

Z-M Weapons LR-300-ML assault rifle, early (circa 2001) version

Z-M Weapons LR-300-SR semi-automatic rifle, late production version (circa 2006)

Para USA Tactical Target Rifle, with buttstock open

Para USA Tactical Target Rifle, with buttstock collapsed

Specifications for Z-M Weapons LR-300 rifles

	LR-300-SR	LR-300-14.5	LR-300-ML
Caliber	5.56x45 mm / .223 Remington
Action	Gas operated, rotating bolt, direct impingement
Overall length	946 mm / 37.25"	896 mm / 35.25"	820 mm / 32.25"
Barrel length	419 mm / 16.5"	368 mm / 14.5"	293 mm / 11.5"
Weigth	2.95 kg / 6.5 lbs	2.72 kg / 6.0 lbs	2.54 kg / 5.6 lbs
Rate of fire	--	--	950 rounds per minute
Magazine capacity	30 rounds

Specifications for Para USA Tactical Target Rifle

Caliber	5.56x45 mm / .223 Remington
Action	Gas operated, rotating bolt, direct impingement
Overall length, stock open (folded)	838 mm (667 mm) / 33" (26.25")
Barrel length	419 mm / 16.5"
Weigth	3.45 kg / 7.6 lbs
Magazine capacity	30 rounds

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The LR-300 rifle was manufactured by the small US-based company Z-M Weapons between 2000 and 2007, when all rights for the design were sold to the Para USA, the US-based subsidiary of the Canadian pistol maker Para-Ordnance Ltd. The reworked LR-300 rifle will be sold in USA as Para Tactical Target Rifle, with first sales sheduled to "early 2009".
Original LR-300 (LR stands for Long Range) rifles were designed by Alan Zitta as an upgrade to the well known and popular M16 / AR-15 rifle. In fact, LR-300 and Para TTR both use standard AR-15-type lower receivers; only upper receivers are different and contain patented modified gas system. The key reason for tha modification was to prowide AR-15-type weapon with capability to mount side-folding stock rather than partially collapsible M4 carbine-type stock. Z-M Weapons intended its rifles mostly for military and law enforcement personnel, by offering LR-300-ML weapons with short barrels and select-fire capability. Civilian (semi-automatic only) versions also were offered to general public, but at prices well above the average price of AR-15-type rifle. It is not known yet if the new Para Tactical Target Rifles will also be offfered in military (select-fire) version or not; current Para USA advertising suggests that only semi-automatic weapons (and upper receiver conversion kits) will be offred, at least initially.

The LR-300 rifle is gas operated, and utilizes modified Stoner-type direc gas imingement system. In this modified system, the gas key is extended forward to form the tube, that protrudes forward from the receiver and into the handguard. The protruding part of the gas key tube is used to host the bolt return spring, which is placed between the front receiver wall and the collar at the front of the gas key tube. The gas tube, which runs rearward from the gas block / front sight base, is strengthened as its rear end floats freely to enter the extended gas key tube when bolt group is in the battery. That way, at least some of the hot gases from inside the gas karrier are expelled outside the receiver and into the inner handguard area, through the extended gas key tube, once it has left the gas tube during the bolt group recoil movement. Additional benefit of this system is that it allows the bolt carrier to be made twice as short compared to the standard AR-15-type bolt carrier. In turn, this results in the fact that there's no need for the recoil buffer tube, which is normally protruding backward from the AR-15-type lower receiver. Because of this feature, most LR-300 rifles are fitted with side-folding shoulder stocks, either sceletonized non-adjustableones made from metal or polymer ones, adjustable for length of pull. Otherwise the LR-300 is similar to the AR-15-type weapons and has similar trigger / safety arrangements, magazine housing and bolt stop device.

Colt M4 and M4A1 carbine / assault rifle (USA)

Colt M4 carbine, current issue model with removable carrying handle

M4A1 carbine (current production model with removable carrying handle)

Old-style M4 carbine (integral carrying handle) with M203 40mm grenade launcher.

Current issue M4A1 carbine with RIS-mounted M203 grenade launcher and a telescope sight

Click here to see the the SOPMOD M4A1 kit (54 Kb JPEG, will open in new window)

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Caliber: 5.56mm NATO
Action: Gas operated, rotating bolt
Overall length: 838 mm (stock extended); 757 mm (stock fully collapsed)
Barrel length: 370 mm
Weight: 2.52 kg without magazine; 3.0 kg with magazine loaded with 30 rounds
Rate of fire: 700 - 950 rounds per minute
Maximum effective range: 360 m

The Colt company developed various carbine versions of the basic AR-15 / M16 rifle since 1970s. These carbines were intended for all markets - military, law enforcement, civilian. US Military (and some other armies, most notably - Israeli Self-Defense Forces) had adopted the Colt CAR-15 Commando and XM-177 carbines during the 1970s and 1980s. But early in 1990s the old idea of replacing the pistols in the hands of the troops with some more effective, shoulder fired weapon, rise again in the heads of the US Military. In fact, this idea can be dated back to the US M1 Carbine of 1941, but good ideas never die. So, in the 1994, US Army adopted the Colt Model 720 selective-fire carbine (basically, a shortened M16A2 rifle), as the US M4 Carbine. This weapon was intended to replace in service some M9 pistols, as well as some aged M3A1 submachine guns and some M16A2 rifles. New weapon was much more handy and comfortable to carry, than the long M16A2 rifle, so the US Special Operations Command (SOCOM) put its eye on the M4 as a possible universal weapon for all Special Operations community. For this purpose M4 was latter modified with the M16A3-style flat-top receiver with integral Picatinny-type accessory rail instead of the M16A2/M4-type integral carrying handle. This modificatin retained the M4 index. The only difference between the M4A1 and M4 is that its trigger unit of M4A1 is modified to fire full-auto instead of the three shots bursts in M4. Specially for the SOCOM M4A1s US Naval Surface Warfare Center developed a SOPMOD M4 kit, that consisted of the M4A1 carbine equipped with Rail Interface System (RIS) instead of the standard handguards. The kit also includes a variety of the add-on goodies, such as various sights (ACOG 4X telescopic, ACOG Reflex red-dot, detachable back-up open sights), laser pointers (visible and infra-red), detachable sound suppressor (silencer), modified M203 40mm grenade launcher (with shortened barrel and improved sights). The kit also included a detachable front grip and tactical light.

From the first sight, the M4A1 SOPMOD is an ideal Special Operations weapon - handy, flexible, with good firepower. But the latest experience in the Afghanistan showed that the M4 has some flaws. First of all, the shorter barrel commands the lower bullet velocities, and this significantly decreased the effective range of the 5.56mm bullet. Second, the M4 barrel and the forend rapidly overheats. Third, the shortened barrel resulted in the shortened gas system, which works under greater pressures, than in M16A2 rifle. This increases the rate of fire and produces more stress on the moving parts, decreasing the reliability. While adequate as a Personal Defense Weapon for the non-infantry troops (vehicle crews, clerks, staff officers etc), M4A1 is, by some accounts, less than ideal for the Special Operations troops, at least in its present state. The idea of the complete re-arming of the US Army with the M4 as a money-saving measure, also is somewhat dubious.

Technical description.
The M4 carbine differs from the M16A2 rifle only by having a shorter barrel and a telescoped, 4-position buttstock. The M4A1 is a similar modification of the M16A3 rifle, so for general technical description please refer to the M16 article on this site.