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This is the info I was looking for. Thank you very much. Got a YHM mite and YHM LT phantom turned around in 3 months. Thanks NFA Trust!
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This topic comes up every once in awhile. I took pics one day just to have them handy.
Here's a 5.56 FH and an LT FH, both threaded 1/2-28:
Notice they're the same...except for the bore:
As opposed to two LT mounts, one threaded 1/2-28 and the other 5/8-24...same bore, different thread pitch:
For my 5.56 hosts, I just buy whichever one I find the best deal on.