This covers cutting/crowning as well as threading. This service is for any AR15/AR10 barrel once it has been removed from the receiver. This service also covers handgun barrels that need standard threads. that do NOT need to be extended. Threads will be concentric to the bore. If you want the barrel shortened note length in the comment section. in This service also covers stripped barrels of other varieties. If sent as a complete upper, the Disassemble/Reassemble service is required as well. Gas port work is included when necessary. When barrels are cut, they are all measured from a closed bolt face as the only standard measurement we use.