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