This 16" rifle chambered in 5.56mm features a Nanoweapon coated Surefire Closed-Tine Flash Hider mounted to an in-house 16" durable black oxide coated, Cold Hammer Forge, Chrome Lined, 1-7 twist Geissele barrel. Our barrels are precision machined and cold hammer forged utilizing the highest quality materials. Exclusive to the Super Duty 16" Rifle is the brand new SSA-E X with Lightning Bow(R) trigger. This nanocoated, two-stage trigger features a wide body and bow shape that finds the perfect balance between a classic M4 trigger and a flat body trigger. At the heart of this rifle is the Geissele Reliability Enhanced Bolt Carrier Group. This Nanoweapon coated BCG features a properly torqued and staked, chrome lined gas key.- CALIBER .223REM/5.56MM NATO- MAGAZINE NO MAGAZINE- BARREL 16" Barrel, CHF, Chrome Lined, 1-7 Twist - Geissele Profile- RECEIVERS Super Duty M4- HANDGUARD 15" SMR MK16 w/ Geissele Center Tab- TRIGGER SSA-E X w/ Lightning Bow- STOCK B5 Systems Enhanced Sopmod Stock- COLOR Olive Drab Green