I have a DPMS Bull 24 rifle. I use it stictly for shooting prarie dogs and coyotes. I have owned the rifle for 5 years without a single problem.
The lower is built well and will accept any standard pin upper.
The bolt and carrier have given me absolutely no problems and the stainless barrel will last my lifetime.
I shoot about 1000 rounds a year, for an idea of how I use the gun.
I would have no problems reccomending a DPMS rifle to someone who has the same shooting habits as myself.