Bushmaster ACR


Senior Member
Nov 25, 2009

The Masada / Bushmaster ACR rifle is gas operated, semi-automatic or selective-fired (Military version only) weapon of modular design. It utilizes aluminum alloy upper receiver, with polymer pistol grip / trigger / magazine housing (lower receiver) unit which is attached to the upper receiver using cross-pins. Various types of lower receivers are planned to accommodate different types of magazines (i.e. Ar-15 type magazines as opposed to AK-type magazines). The trigger / manual safety unit is made as a single removable item, and it mostly utilizes Ar-15-compatible parts. The barrels of ACR / Masada are quick-detachable, with short-stroke gas pistons attached to each barrel. To remove the barrel (for change, inspection or maintenance), user has to remove polymer handguards, then swing down the wire lever, located below the barrel, turn the barrel to unlock and pull it forward and out of the receiver. All barrels are free-floated within handguards to achieve consistent accuracy. Bolt group also is made as a single unit, with captive return spring and rotary multi-lug bolt which locks directly to the barrel breech. The standard magazine housing, which is suited to accept Ar-15 type magazines, has ambidextrous magazine release buttons. The ambidextrous bolt stop release button is located at the front of the triggerguard. Safety lever is also ambidextrous, and charging handle can be installed on either side of the gun, depending on user preferences. Depending on the version (or user preferences) ACR / Masada rifle can be equipped with various Magpul-made buttstocks, fixed or side-folding, and adjustable for length of pull (some also with adjustable cheek rest). Each Masada / Bushmaster ACR rifle gas integral Picatinny rail on the top of the receiver; additional accessory rails can be installed on forend according to user preferences. Masada / Bushmaster ACR rifle can be fitted with removable iron sights, and/or with any optical or night sight with appropriate mounting.

Weight 3.75 kg (8.3 lbs; 16.5-inch barrel)
Barrel length 419.1 mm (16.5 in)
Cartridge 5.56x45mm NATO
Action Gas-operated, rotating bolt
Rate of fire 750-800 RPM
Muzzle velocity 792-990 m/s (2600-3250 ft/s)
Effective range 300-600 m (328-656 yd), depending on configuration
Feed system 30-round detachable box (5.56 variant) magazine, staggered-column magazine (STANAG compatible)
Sights Rear: none included (Picatinny rail); front: integral flip-up, adjustable post


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