Just a quick question. I bought a used DD M4V3 a little over a year ago. The guy had replaced the FSB with a low pro gas block.
Anyway, I like keeping my weapons stock, so I had a local gunsmith put the original FSB back on. It was the original, so the pin holes should line up.
A few months ago I was checking it out, and the front sight post is about 1/16" off of the centerline of the bore.
Is this within spec? The rear BUIS is cranked over 3/4 of the way to the left, but it isn't bottomed out, and I have a good 50m zero with it. I am only concerned that it may be off at extended range. I never tested it though, cause I just always checked my BUIS zero and shoot with my ACOG.
Thanks!


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