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 ½ x 28 rh threaded – Rifling 6 grooves rh twist 1:10 in. – Handguard Mlok (free floating) heatshield