Zenith ZF56000016: The ZF-56 16 is a semi-auto rifle with a roller-delayed blowback operating system. This rifle is chambered in 5.56 and comes with a full length Picatinny rail & a cold hammer-forged barrel. The American Made ZF-56 also features a last round bolt hold open system. This firearm features a buffer tube compatible end cap along with a buffer tube and stock. - Whats included - (3) 30 round AR magazine - High-quality carrying case - User Manual - Limited Lifetime Warranty - Buffer tube compatible end cap - Buffer tube and stock - Specs - Caliber 5.56 - 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 7.5 lbs. - Barrel length 16 in. - Barrel cold hammer forged 4150 cmv x 28 rh threaded - Rifling 6 grooves rh twist 1:10 in. - Handguard M-LOK (free floating) heatshield