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The upper and lower receivers of the FGC-9 are fully 3D-printed, as are its pistol grip and stock. Its magazine, based on the Glock magazine design, may also be printed. For the MkI, an AR-15 or modified airsoft trigger system is needed for the fire control. In the MkII release, the developers released a package to 3D-print the AR-15 trigger.
AR-15 Sporter (SP1) A1 Triangular S-1 A1 No No .222 REM 20 in. A1 1:12 Yes A1 R6420 AR-15A2 Sporter II Carbine 3rd Generation Short Ribbed S-1 A1 Yes No & Yes 5.56 NATO 16 in. A1 1:7 Yes A2 R6430 Sporter Lightweight (9 mm) A2 Short Ribbed S-1 A1 No Removable 9mm NATO 16 in. A1 1:10 Yes A1 R6450 AR-15 9 mm Carbine 3rd Generation Short Ribbed S-1
Any AR-15/AR-10 cartridge cases that are derived from the 7.62x51 can also be formed from these listed calibers. (7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.) AR-10: The AR-10 is slightly larger and heavier than the AR-15.
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The OA-93 is an AR-15 derivative pistol manufactured by Olympic Arms.Lacking a buttstock or buffer tube, the OA-93 disperses recoil through a specially designed flat top upper receiver similar to the Armalite AR-18.
The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [84]
Magpul has been granted a patent [47] for a STANAG-compatible casket magazine, [48] and such a magazine was also debuted by SureFire in December 2010, and is now sold as the MAG5-60 and MAG5-100 high capacity magazine (HCM) in 60 and 100 round capacities, respectively, in 5.56mm for AR-15 compatible with M4/M16/AR-15 variants and other firearms ...
A goal of the effort was to give snipers a weapon that didn't "stick out" as a sniper rifle; with a suppressor, the M110 is 46.5 in (1,180 mm), 13 in (330 mm) longer than the M4 carbine and 7 in (180 mm) longer than the M16A4 rifle. A minimum of 30 CSASS units will be used for production qualification testing and operational testing over 24 months.