Here is my favorite .22 ever. CMMG barrel & bolt carrier on a Colt upper. I need to upgrade the front quad rail as it to heavy. Insight MRDS (Mini Red Dot Sight) on American defense mount. Black Dog Machine 50 round drum, Silencerco Spectre II suppressor. Work great on the M16 lower. Currently on an Aero Gen 2 I put together with KAK brace. I had more room for another complete gun over the upper taking up shelf space