Adaptive Combat Rifle it's design and Variants

The Remington ACR (Adaptive Combat Rifle) is a modular assault rifle designed by Magpul Industries of Austin, Texas and was known as the Masada. In late January 2008, Bushmaster Firearms International entered into a licensing agreement with Magpul whereby Bushmaster would take over production, future development, and sales of the Masada. It was then known as the Bushmaster ACR. However, Remington Arms is contracted to manufacture the rifle for the US military and US law enforcement agencies. The Remington ACR was one of the weapons displayed to U.S. Army officials during an invitation-only Industry Day on November 13, 2008. The goal of the Industry Day was to review current carbine technology prior to writing formal requirements for a future replacement for the M4 Carbine. It was also part of the Individual Carbine competition to replace the M4. Remington Arms is responsible for the selective fire version of the ACR, while Bush master Firearms International is responsible for the semi-automatic only version. Design Remington ACR The Remington ACR is a gas operated, selective fire weapon with a modular design. It has several features of other recent designs, such as the M16 and FN SCAR. The key idea of the ACR's modular system, is that it will provide a wide variety of configurations within the matter of minutes. It is only available for the military and law enforcement market in 5.56×45mm NATO and 6.8mm Remington SPC. It can change calibers from 5.56 mm to 6.8 mm in minutes at the user level by changing the bolt head, barrel, and magazine. All of the rifle's parts can be easily stripped for cleaning and all of its controls are fully ambidextrous. A three position (safe, semi-auto and full auto) fire selector lever is located over the pistol grip. A charging handle can be installed on either side of the receiver and does not reciprocate when the weapon is fired. Magazine release button is also ambidextrous. Spent case ejection port is located on the right side of the receiver, however it has case deflector, which propels the cases away from left-handed shooters. The rifle can also be configured for handguard, stock type and trigger unit setup. Among the options for the ACR are various stocks including a fixed adjustable (in terms of length of pull and cheek weld), folding adjustable (folding and six-position telescoping), and sniper stock based on the Magpul PRS stock. The Remington's handguard model has a five-sided aluminum handguard that can be user configured with MIL-STD-1913 rail elements, while the Bushmaster's model is polymer with heat guards and attachable aluminum tri-rail. The magazine conceived for the 5.56×45mm version of the rifle is called the Magpul PMag, a high-impact, 30-round, polymer magazine claimed by Magpul to be significantly more resistant to wear, shock, and harsh environments than other counterparts on the market. The PMag is STANAG 4179-compatible, as it will readily fit any STANAG magazine firearm, including the M16 rifle family. The rifle is available with four barrel lengths and can be easily converted from a standard assault rifle (with a 16.5 inch barrel) into a carbine (with a 14.5 inch barrel), into a compact assault rifle (with a 10.5 inch barrel), or into a designated marksman rifle (with a 18 inch barrel) without any tools. Barrel lengths of the two calibers are exactly the same. The Barrels are hammer-forged and hardened with a nitriding process rather than having chrome plated bores as some other rifles. Bushmaster ACR The Bushmaster ACR is gas operated, semi-automatic rifle of modular design. It utilizes an aluminum alloy upper receiver, with polymer pistol grip, trigger, and magazine housing (lower receiver) unit which is attached to the upper receiver using cross-pins. It is available for the civilian market in 5.56×45mm NATO, 6.8mm Remington SPC and other aftermarket caliber conversions are also available. The trigger/manual safety unit is made as a single removable item, and mostly utilizes AR-15 compatible parts. The rifle features a quick-detachable barrel, with its own short-stroke gas piston attached. To remove the barrel (for change, inspection, or maintenance), the operator has to remove the polymer handguards, then swing down the wire lever which is located below the barrel, and then turning the barrel to unlock and pull it forward and out of the receiver. All barrels are free-floated within the handguard to achieve consistent accuracy. The barrel is like an AR-15 barrel with a resized gas port and a thin profile for the piston support. The 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 trigger guard. Safety lever is also ambidextrous, and charging handle can be installed on either side of the rifle. It can be equipped with various Magpul-made buttstocks, fixed or side-folding, and adjustable for length of pull (some also with adjustable cheek rest). It can be fitted with removable iron sights and/or with any optical- or night vision- sights, all depending on the user's preference or with the configuration of the rifle. It also has an integral Picatinny rail on the top of the receiver and additional accessory rails can be installed on the forend according to user preferences.[24] The Bushmaster's handguard model is polymer with heat guards and attachable aluminum tri-rail, while the Remington's model has a five-sided aluminum handguard that can be user configured with MIL-STD-1913 rail elements. Variants Remington ACR The Remington ACR is a selective fire modular rifle that is only available for the military and law enforcement market in 5.56×45mm NATO and 6.8mm Remington SPC. Assault rifle – 16.5 inch (419.1 mm) barrel Carbine – 14.5 inch (368.3 mm) barrel Compact assault rifle – 10.5 inch (266.7 mm) barrel Designated marksman rifle – 18 inch (457.2 mm) barrel Bushmaster ACR The Bushmaster ACR is a semi-automatic modular rifle that is available for the civilian market in 5.56×45mm NATO, 6.8mm Remington SPC and other aftermarket caliber conversions are also available. ACR BASIC – 16.5 inch (419.1 mm) barrel ACR ENHANCED – 16.5 inch (419.1 mm) barrel ACR DMR – 18.5 inch (469.9 mm) barrel ACR SBR – 10.5 inch (266.7 mm) barrel