| rdfs:comment
| - The original Magpul Masada design represents an amalgamation of several recent rifle designs, incorporating what is considered by its designers to be the best features of each in a single, lightweight, modular rifle platform. Design features from the Armalite AR-18 (short-stroke gas system), the FN SCAR (upper receiver, charging handle location), the Heckler & Koch G36/XM8 (liberal use of polymer components), the M16/AR-15 (trigger pack), and the M16 (barrel, fire control group) are clearly prevalent. The rifle also includes several features developed by Magpul, such as a quick-change barrel/trunnion system, adjustable gas regulator, non-reciprocating charging handle, and storage compartments located in the stock and grip. Just prior to the deal with Bushmaster, Magpul made additional chan
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| abstract
| - The original Magpul Masada design represents an amalgamation of several recent rifle designs, incorporating what is considered by its designers to be the best features of each in a single, lightweight, modular rifle platform. Design features from the Armalite AR-18 (short-stroke gas system), the FN SCAR (upper receiver, charging handle location), the Heckler & Koch G36/XM8 (liberal use of polymer components), the M16/AR-15 (trigger pack), and the M16 (barrel, fire control group) are clearly prevalent. The rifle also includes several features developed by Magpul, such as a quick-change barrel/trunnion system, adjustable gas regulator, non-reciprocating charging handle, and storage compartments located in the stock and grip. Just prior to the deal with Bushmaster, Magpul made additional changes to their design; the most obvious of these is the relocation of the ambidextrous operating handle to a forward position (somewhat similar to the Heckler & Koch G3 and Heckler & Koch MP5 series of weapons). Experts from Magpul Industries have on several occasions mentioned that depending on the barrel length of the weapon, the rate of fire is estimated to be in the range of 600-800 rpm (this is an estimate; specifics have not yet been verified). Bushmaster Firearms, with the help of Remington Arms (a sister company in the Freedom Group, Inc portfolio that includes Bushmaster, Remington, Marlin, and DPMS Panther Arms brands) has also made some design changes based on extensive environmental and functional testing specifically to meet the emerging requirements of the US military in both the carbine and subcompact weapon versions of the ACR family. The ACR is currently offered to military and civilian personnel in .223 Rem/5.56. Bushmaster expects to have kits available soon to switch the caliber of the rifle to 6.8 SPC and 7.62x39mm just by replacing the barrel, bolt carrier, and magazine. Other calibers are also being considered. It is also expected that the ACR will have barrel length options of 10.5, 12.5, 14.5, 16 (commercial), and 18 inches. Among options for the ACR include Fixed Adjustable (in terms of length of pull and check weld), folding adjustable, and a sniper stock based on the Magpul PRS stock, and four handguard options including long and short polymer handguards with heat shield and attachable rails, aluminum Trirail and, on the Remington model, a five sided aluminum handguard that can be user configured with Mil-std-1913 rail elements. A Model of the ACR manufactured by Remington has been offered as part of the Army's Individual Carbine competition The magazine conceived for the 5.56mm version of the ACR 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,and although it was designed exclusively for the AR-15 family, there is a variant of it called the E-Mag (E standing for Export) that will readily fit any STANAG-compatible weapon.
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