I didn't want another 5.56/Wylde, 300BO, 6.5G, 6ARC, or .308 build and assembled a 7.62x39 build with parts I had around and a POF 16.5" barrel when they closed them out. With Duramags, enhanced bolt/firing pin, and a Larue MBT (with extra power springs) it has been flawless. No adjustable gas...