SA-15 Folding 16" Pro Rifle built on the Shield Arms Folding Lower Receiver (FLR) for compact storage. This patented system allows the firearm to fold and does not use an adapter. This system is lighter, stronger, and shorter in overall length versus popular folding adapters. Additionally, this system does not modify the carrier. Build Specifications Upper/Lower: 7075-T6 billet aluminum upper/lower Barrel: 16" length, 5.56 NATO Chamber Mid-length length gas system 1:7 RH twist 4150 CMV Stress relieved after rifling Black Nitride finish M4 extension .076" gas port Bolt Carrier Group Black Nitrid Mfg: Shield Arms
