For those who prefer a bit more caliber in their AR, there's the P308. Chambered in 7.62x51 NATO (308 WIN), the P308 operates on a short-stroke gas piston system. The 16.5-inch, 1:10 twist, match-grade, nitride heat-treated barrel is threaded 5/8x24. Other features include a 5-position adjustable gas block, a 14.5-inch M-LOK MRR free-floating rail, an A2 flash hider, a mil-spec trigger, and Mission First Tactical furniture. The P308 comes standard with a 20-round Magpul magazine. Specifications: E2 Dual Extraction Technology Chamber Weight: 8.37 lbs(empty) 5/8x24 Threaded 1:10" Rate-of-Twist 16.5" Match-Grade Nitride Heat-Treated 5-Position Adjustable Gas Block 14.5" M-LOK MRR Free-Floating Rail Handguard A2 flash hider Also Includes: High Phosphate Nickel Coated Bolt Carrier Group, Chrome-Plated Bolt, 7-Position Anti-Tilt Buffer Tube, Magpul 20-round Magazine, and Teflon Receiver Tension Screws