Serbu Firearms’ Upper Receive for the AR-15/M-16
-Uses standard AR-15/M-16 bolt heads, extensions, and barrels.
-Entire upper receiver is 7075 aluminum alloy extrusion, hard coat anodized.
-Available in 2 receiver lengths; a short pistol/PDW version and a long carbine/rifle version.
-AK-47 style recoil spring eliminates stock spring, buffer tube and buffer.
-Proprietary bolt carrier and operating rod, piston driven.
-Non-reciprocating charging handle mounts to either left or right side.