SA-AR-2 ''Pitbull'' Carbines and Rifles

The entire AR-2 family, admittedly still in the WIP stage
The three rifles at the top are 'Carbine' class rifles, and feature a short stock, short receiver and short barrels with direct impingement operation. The two bottom rifles are 'Rifle' class weapons, and feature extended stock, receiver and barrels, and a heavy-duty short-stroke gas piston.

The receiver has been strengthened with a heavier-duty return spring behind the bolt and greater recoil length to accommodate the piston, the longer stocks are to better control fully-automatic fire.

The three carbines are 10-inch, 12.5-inch and 14.5-inch barrel lengths, while the two rifles are 16-inch rifle and 18-inch heavy-barrel (HBAR) intended as a support/marksman weapon.
The three carbines can all be adapted to take slightly shortened gas pistons by giving the larger receiver, and fitting a piston and piston tube - the 'carbine rifles' images is of them with the extended receiver, but with DI still equipped.

The Carbines are equipped with the Noveske flash hider, the two heavier Rifles will be given the AAC Blackout flash hider.