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The AR-57 PDW upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. [1]
Subsequently, it has been used in a number of other weapons, such as the FN PS90 carbine and the AR-57, an upper receiver for M16 and AR-15 rifles. [ 17 ] [ 18 ] The ST Kinetics CPW can be configured for the 5.7×28mm cartridge by changing the barrel and magazine groups. [ 42 ]
AR-57: 5.7×28mm: United States: yes M16 lower receiver with a redesigned upper receiver fed by FN P90 magazines Brügger & Thomet MP9: 6.5×25mm CBJ, 9×19mm: Switzerland: yes CF-05: 5.8×21mm: China: no Competitor to the QCW-05: Colt MARS 5.56×30mm MARS United States: no Colt SCAMP.22 SCAMP United States: no ČZW-438: 4.38×30mm Libra: Czech ...
The KAC's lower receiver, holding the magazine and trigger assembly, is essentially a shortened M16 rifle lower receiver, which makes the basic operating controls familiar to many potential users. [ citation needed ] However, the cartridge, upper receiver, and operating mechanism are all new designs by KAC.
The resulting COAL of 2.300" is only 1.02 mm longer than the maximum COAL for chambering a cartridge in the smaller AR-15; however, the 45 Raptor chamber pressure is allowed to be as high as 62,000 PSI. This means that the stronger AR-10 receiver and bolt carrier group is needed for shooting this cartridge.
Like the P90, the rounds are rotated at a 90-degree angle from the magazine into the chamber. A Picatinny rail is located on the upper receiver, [5] and a second rail is located below the magazine. [6] The trigger pull is 5 lb (22N). [7] [8] The barrel and moving parts are made from steel, with a polymer frame and lower receiver to reduce weight.
The upper receiver incorporates the hand guard, the charging handle, the forward assist, the gas operating system, the barrel, the bolt and bolt carrier assembly. AR-15s employ a modular design. Thus one upper receiver can quickly and easily be substituted for another. Upper receivers are available with barrels of different weights, lengths ...
SIG designed the upper receiver to be compatible with standard AR-15 and M16 lower receivers [10] [12] with the help of an adapter. [15] An integrally suppressed upper receiver group based on the MCX was selected by USSOCOM for the SURG (Suppressed Upper Receiver Group) contract in July 2018. These suppressed uppers would be paired with ...