POF Wonder 5.56mm NATO 16.5in Blue Titanium Semi Automatic Modern Sporting Rifle - 30+1 Rounds - The Wonder DI (Direct Impingement) is the answer to a lightweight carbine with just the right amount of upgrades. The Adjustable Gas Block lets you tune your rifle to the exact operating speed it should be. Its patented E2 dual-extraction technology consists of four small channels cut into the walls of the chamber allowing a small amount of gas pressure to push against the neck of the spent case. The Wonder DI rifle also utilizes a non-adjustable single-stage and a mil-spec aluminum anti-tilt buffer tube which features "carrier cradle" extensions to ensure that the carrier is always supported by the buffer tube and has three drain holes. E2 Dual Extraction Technology; Direct Impingement; MIL-SPEC Upper Receiver; Match Grade Nitride Heat-Treated Puritan Barrel; Carbine Length Low Profile Gas Block; 14.5in M-LOK Renegade Free-Floating Rail With 4 Integrated QD Sling Mounts; Single Port Micro-B Muzzle Brake; 3.5lb POF USA Flat Trigger With KNS Anti-Walk Pins; 6-Position Anti-Tilt Buffer Tube; One Mission First Tactical 30-Round Magazine; Teflon Receiver Tension Screws;