This drilling jig permits cleaning a 10/22 from the rear without removing the barrel. It locates the correct spot on the rear of the receiver for a hole to be drilled that allows the cleaning rod to pass through. Helps keep the rifle accurate by eliminating damage done by the cleaning rod when inserted through the muzzle. Notes:Remove the two bolts and fiber washers from the fixture. The 10/22 receiver must be completely disassembled with all parts removed, however the barrel can stay in the receiver. The fixture mounts to the right side of the receiver. Use some suitable material to protect the receiver, then place it on the fixture, lining up the threaded holes in the fixture with the trigger guard retaining pin holes. Use the bolts with the fiber washers to hold the receiver on the fixture. Put the receiver with the fixture in a padded vise, orient it so that the rear of the receiver is facing up. Use a .257" diameter drill bit (this is an "F" drill bit) to drill a...