Re: Does a TAC 15 (the non-i version) keep its zero when re-assembled?
I have discovered a very interesting thing with my tac15....I have two ar's...and with the lower from one if I sight it for dead center hits, at say, 50 yards, then switch to the other lower, my point of impact changes about 6 inches. I have switched back and fourth several times, and lower #1 will hit dead center (or as near to dead center as tac-15s will...+- and inch or so), and lower #2 will ALWAYS hit 6 inches low/left.
I'm not sure why this is, but might be because lower #1 is collapsible stock, and lower #2 is fixed stock...that really is the only difference between the two lowers. And yes, I have adjusted for parallax.