Features: Receiver Model: WORKHORSE (Forged) Type: Semi-Auto other Caliber: 223/5.56X45 Muzzle Thread: 1/2x28 TPI Rail Length: 9.5in WORKHORSE M-LOK Free-Float Rail Gas System: Mid Length Barrel Length: 12.5in Barrel Twist Rate: 1:7T Barrel Profile/Finish/Material: Medium Profile 4150 CM Barrel, Black Nitride. .750 Diameter Gas Block Journal Overall Length: 29in (736.6mm) Collapsed Length: 26.25in (666.75mm) Charging Handle: RACK Ambidextrous Charging Handle Trigger: Enhanced Nickel Teflon Safety: Enhanced Single Sided safety Stabilizing Brace: Gear Head Works Pistol Brace Finish: BATTLEARMS Combat Gray Magazine: (1) 30rd Magazine Sights: Optics Ready Platform