I built an M4 with a DPMS 16" heavy contour barrel. I am a Combat Arms Instructor in the AF, re barreling M4/M16's is something I do on a regular basis. The problem I have is that I cannot get it to zero with a BUIS. It shoots about a 12" to the right and 12" high, to move the front sight post down that far would mean taking it all the way out. anybody had this problem before? what would be the issue? It is a brand new barrel and it is only torqued to 42 FT LBS. Would switching the front sight post with a shorter one work? The rear sight is also an issue, with it pegged to the far left it still shoots 7" to the right. Thoughts?
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