Lacquer build up is no problem either with a little minor cleaning maintenance. Just every so often, 500 rounds, say, or anytime the bolt starts getting 'sticky', get some lacquer thinner, attach a chamber brush or shotgun brush to one section of cleaning rod. Dip the brush in the lacquer thinner and chuck the rod section into a drill and go to work on the chamber. Dip the brush frequently and soon the chamber will be lacquer free. You'll want to do this with the action out of the stock- lacquer thinner won't do your stock finish much good though technically lacquer thinner should have no effect upon dried shellac.
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