I don’t care for DPMS for many of the same problems.
I have a DPMS, Sig, and a Windham CDI. In order of quality, it’s Windham, Sig, then FAR, FAR below DPMS.
I was having failure-to-feed on the DPMS, and realized it’s very finicky about mags. The metal one that came with it just didn’t work, and I switched to one of my Magpul, which decreased the issue markedly, but it still happens.
Plan on unloading it.
I have a DPMS I bought in 1999. It’s been a flawless rifle for me. 20” superbull barrel 1:8 5.56. After a JP trigger upgrade, she’s a 1/4 MOA rifle.