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Old 01-10-2021, 12:28 PM
nf1e nf1e is offline
 
Join Date: Apr 2012
Location: Connecticut
Posts: 2,667
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10 to 20 ths as I remember. Been at least 10 years since I ground one down. Must have worked because I still have two rifles with them in service rifle builds and they do a great job. Much better than most usgi chrome lined barrels, that I have used over the years.
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