If the bolt is the older style with the square base, the "legs" on the bottom of the thumbpiece may not be quite long enough to leave enough gauge for the assembled parts to move fore and aft with the frame between them. In this particular assembly, the assembled thumbpiece stands approx. .110" off of the bolt when the nut is snug.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 12-31-2016 at 08:48 PM.
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