I had two DPMS rifles, key word being HAD
I have never had a rifle that was semi automatic, the was more like a reincarnated muzzle loader, until I owned a DPMS. The two that I owned end up back in their shop many more times then I got to shoot them.
Chambers are tight, and I have noticed this on Full Auto versions also. I cant believe they actually sell them to police departments where someone is going to have to put their life in the hands of a rifle that can not seem to get more than one or two shots off and then have to ram a cleaning rod down the barrel to get the spent casing out. Their (DPMS) response usally is bad ammo, or the chamber is dirty. As far as that goes I have a ArmaLite M15A2, that had 14,000 rounds through it before I cleaned it, It had ate every type of ammo never once was there a FTF, FTE, etc.....just keeps on runing and runing. I seen this first hand today at our local Machine Gun shoot .
My advice is to look at Colts, ArmaLites, or maybe even a LMT. I just dont think much of DPMS latley and would never give any of their products plug.