With its origins stemming from legendary military manufacturing, it only makes sense that FN would chamber its M4-derived FN 15 Tactical Carbine in the popular .300 AAC Blackout cartridge. The .300 AAC Blackout cartridge was developed at military request to offer the ballistic performance of the 7.62x39mm cartridge from an M4-style rifle platform. The first FN-made AR-15 to be chambered in .300 AAC Blackout offers optimized performance with extremely low-felt recoil from the FN-signature, 16-inch, alloy-steel, cold hammer-forged, chrome-lined barrel and carbine-length gas system. Additional features include a low-profile gas block, a SureFire ProComp muzzle break, Magpul MOE furniture, and a Midwest Industries rail system. Ergonomic safety lever and magazine release. AForward assist feature. 30-round Magpul Pmag. 1 in 7" twist.