Zenith ZF300BKOUT12: The ZF-300 12 is a semi-auto pistol with a roller-delayed blowback operating system. This pistol is chambered in 300 Blackout and comes with a full length Picatinny rail & a cold hammer-forged barrel. The American Made ZF-300 also features a last round bolt hold open system. This firearm features a buffer tube compatible end cap. - Whats included - (1) 30 round AR magazine - High-quality carrying case - User Manual - Limited Lifetime Warranty - Buffer tube compatible end cap - Specs - Caliber .300 Blackout - Operating system roller-delayed blowback - Mode of fire semi auto - Magazine 30-round AR Mag - Trigger pull 6-8 lbs. - Safety Ambidextrous manually actuated lever - Weight firearm without magazine 7 lbs. - Barrel length 12 in. - Barre cold hammer forged 4150 cmv 5/8 x 24 rh threaded - Rifling 6 grooves rh twist 1:8 in. - Handguard M-LOK (free floating) heatshield