Caliber: 5.7x28mm – Capacity 20 – Handguard M-LOK® Attachment Slots – Sights None – Receiver Material Aluminum Alloy – Receiver Finish Type III Hard-Coat Anodized – Barrel Feature Threaded – Thread Pattern 1/2-28 – Barrel Length 10.30 – Overall Length 16 – Barrel Material Aluminum Alloy – Barrel Finish Nitride – Weight 66.5 oz. – Grooves 8 – Twist 1:9 RH – Large format pistol utilizes the same steel magazines and familiar ergonomic controls as the Ruger-5.7 pistol. – Features a 10.3 nitride treated steel barrel for strength accuracy and longevity. – 1/2-28 TPI threaded barrel with thread protector allows for the attachment of popular muzzle accessories. – Impressive ergonomics with ambidextrous manual safety reversible charging handle ergonomic bolt release and extended magazine release latch. – Utilizes Ruger’s safe reliable and proven Secure Action fire-control system that combines a protected internal hammer with a bladed-safety trigger. The trigger has a short smooth pull clean break and positive reset. – CNC-milled handguard that is Type III hard-coat anodized aluminum for maximum durability with M-LOK® accessory attachment slots. Multiple QD sling sockets for maximum versatility. – Full-length Picatinny rail for optic mounting. – Safety features include: 1911-style ambidextrous manual safety; an integrated trigger safety; neutrally balanced sear with significant engagement and strong spring tension; and hammer catch to help prevent the hammer from contacting the firing pin unless the trigger is pulled. – Also includes: one Ruger-5.7 steel pistol magazine ambidextrous magazine button M-LOK QD sling socket hand stop and hex wrench for disassembly.