CALIBER: 7.62 x 51mm NATO - BARREL LENGTH: 20 - WEIGHT: 8.75 lbs (3.97kg) - MUZZLE THREADS: 5/8 x 24 TPI - RIFLING: 1/10 RH - Forged lower receiver - LWRCI� Monoforge� Upper Receiver is stronger and lighter � increased rigidity = improved accuracy - 20 position gas block for maximum tuning of attachments and ammo - Geissele SSA-E trigger - Magpul UBR stock - LWRCI� Patented Short Stroke Gas Piston system for unparalleled reliability - Top Side Ambidextrous Charging handle same length as standard AR 10 - LWRCI� Cold-Hammer-Forged NiCorr-treated Barrel - LWRCI� 12.5 Modular Rail System. Removable top-rail with 100% return to zero no tool re-installation. Allows for quick access to piston system - Fully Ambidextrous Lower Controls: Mag Release Bolt Catch & Release and Selector - Upper and Lower receivers machined from billet aluminum delivering rugged durability and lighter weight - LWRCI� Skirmish Back Up Iron Sights - Surefire� SFMB suppressor adapter - Sub MOA Accuracy