Quoted: Are Fulton's T-numbered uppers of the correct "MIL-SPEC" height like Colt's and LMT's?
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I dunno! Anybody out there know just what "correct 'MIL-SPEC' height" for one of these things really is? I realize that there have been reports of trouble zeroing when using a Colt flattop upper with removable carryhandle sights and a standard (non-F) FSB, but I've personally tried this with a few examples available to me and haven't encountered any prob's.
I can say this about Fulton's T-numbered upper -
I built an A4 clone using an MT6700 lower, Fulton upper, KAC M5 RAS, Colt A2 GI barrel w/ std. FSB and installed a KAC 300M BUIS on it. No trouble zeroing using 50yd. Santose method and 300yd. hits are right on the money. I see no problems with the height of the rail on Fulton's T-numbered upper on this example.
As always, YMMV!