2 things i can name off the top of my head is chrome lined bore and inferior barrel steel. dpms uses 4140 instead of the better 4150.
the colt uses a mil-spec buffer. DPMS does NOT do HPT or MPI on their bolts. the chances of getting an improperly staked key is much much higher with DPMS. DPMS also had an issue not too long ago with putting .223 barrels on guns that were marked as 5.56. out-of-spec lowers and incomplete LPKs happen way too much.
the usual complaint about colt seems to be the price and the occasional swirls/machining marks, which is cosmetic. yes, colts can fail. but other rifles appear to fail a lot more often.
i'm noy saying a DPMS won't work out great. all i'm saying is that is completely false that a DPMS and a Colt/DD/KAC, etc are equal. they are most definitely not. oh a Colt 6920 can be had for $1100 new if you know where to look.
Colt are a great rifle but for the money you will get more form DPMS i would love to have a colt but if it mill-spc its all the same
i second that motionI like Bushmaster.
Someone had to say it
DPMS = Didin't Pass Mil Spec
Colt's are not mil-spec either.