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Which one did you buy on Amazon?
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I purchased the .21875 rod to use for 5.56 suppressors since the land-to-land measurement of a .223 barrel bore is .219. Of course there is a slight possibility that the .002 tolerance of the rod you receive is on the high end, which would result in it being just a hair too large. So far, I have not encountered this issue, but it is possible. For all .30 cal bores (7.62, .308 etc,.), I ordered the 0.296875 rod. I have ordered several times to make alignment rods for friends and family, but have not received any rods that approached the upper end of tolerance. I just cut to length, bevel the edges, give them a light hand polish with 3000 grit sanding sponge, wipe it down and insert via the muzzle *gasp!!*. Don't use any lubricant or it might cause friction issues between the metal surfaces due to tight tolerances.