SA-4 Features Everything you need and nothing you don't. Our non-folding 16" A2 build is a lightweight and reliable weapon system that you can depend on when it matters. SA-4 Specifications Upper/Lower: 7075-T6 forged 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 Nitride finish Shot-peened Magnetic Particle Inspected 9310 5.56/.223 bolt 8620 M16 carrier Hardguard: Magpul MOE SL Mid-length Trigger: Enhanced Milspec Safety: Shield Arms Ambi Safety Selector Grip: Magpul MOE SL Muzzle Device: A2 Buttstock: B5 Systems Bravo Trigger guard: B5 Systems Charging handle: Milspec Weight: 6.7 lbs Ships with 1 magazine

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