The FN 15 Tactical is duty-ready straight out of the box. Equipped with the FN Rail System, the carbine provides exceptional strength and durability over conventional systems and offers a stronger, more rigid platform for accessories and optics that will maintain their true zero, regardless of any impact to the carbine during fire. Additionally, the FN 15 Tactical Carbine II features a 16" alloy-steel, cold hammer-forged and chrome-lined barrel with a carbine-length gas system, low-profile gas block, SureFire ProComp muzzle brake, and Magpul MOE furniture. his model is chambered in 300 AAC Blackout.