Swapped the polymer trigger group for the metal trigger group from my M&P15 and took it out to Badger Guns yesterday with my brother. Put a few hundred rounds through it and it ran great. Couple extraction issues but nothing major. Now to find metal trigger parts and get this thing goin!! Or, maybe I'll leave it in there and pick up a RRA 2 stage trigger for my M&P. I tried one out at Badger and really liked it!!