OPEN BOX MODEL. BRAND NEW! NEVER SOLD or SHOT. SA-4 16" Mid-length A2 - 5.56 NATO Build 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 Shot peened Magnetic Particle Inspected 9310 5.56/.223 bolt 8620 M16 carrier Handguard: 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 Rear Sight: Griffin Armament M2 Charging handle: Milspec Weight: 6.7 lbs Ships with 1 magazine