looking into getting a piston ran upper this cmmg seems to be at a good price point however cmmg is one of the many more common ar-15 makers that I dont really know anything about good/bad/ok. Most of the other brands you hear alot about but I really never hear anything on cmmg either way. Any experience with this upper or your thoughts on it? CMMG M4LEP II Complete Piston Upper Wanna kill these ads? We can help!