Among other things, the barrel nut wrench is useful for tightening a loose barrel nut which isn't all that uncommon according to Belt_Fed who has told me he's received several 15-22 with the barrel nut loose. There are a couple guys who sell the wrench here in the 15-22 Classifieds
*** 15-22 Specific CLASSIFIEDS ***. No crush washers or anything else involved other than the barrel and barrel nut. There are full video instructions in the Instruction Video Series here-
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