I've seen many of articles and threads talking about too loose a receiver fit. Most of the ARs I done have been just fine but I've run across a issue with DPMS uppers and lowers twice in which with the new upper does not close down enough to allow the rear pin to be pushed in and allow alignment of the bolt carrier to the buffer tube.
Last time I just sanded the rear of the upper till it dropped in (it appears to be only at the rear where they make contact that the excessive material is) and got it smooth and used alumi-black to touch it up.
My question is simple, is this the norm with DPMS receivers? I've used Bushmaster, PWA and not had this problem. Just curious.


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