Calibers: 5.56 NATO or 300 BLK. Integrally suppressed AR-15 rifle with no SBR permit required. 16.25” overall barrel length, with 9” barrel with integrally machined HM Monobloc gas block and 7.25” integral suppressor. Free-floated barrel in HM Defense free-float Picatinny rail with M-LOK slots. Eliminates gas block installation and alignment. Mil-Spec M4 feed ramps. Comes with Stealth556 Integral Suppressor (NFA Item) with baffles machined from 17-4 PH stainless steel and heat treated to H900. Weight: 7.9 lbs (without magazine). SEE POLITICAL PANIC PRICING.