I have a smith and wesson _M4_m+p ar setup. Served me well for a year and a half with no problems, LOVE this gun, its my fav in my collection and I think my favorite gun made period. So solid and damn accurate for only 16". The only thing I might want to change about the gun is the trigger assembly. It's a hard pull. Anyone have an edjucated oppinion on what I should go for in terms of a smooth, light trigger? I know that this assembly is durable, but I'd like a durable and SMOOTH trigger pull. The smoothest and best out there. Not worried about it wearing out because if its quality AR parts then its gonna serve well. Of course. ARs are the best built machines in the world! Honk if you agree!