Easiest way is put a cleaning rod down it with a brush, mark the rod at the muzzle, pull the brush through until the mark is on top again and mark it again at the muzzle then measure the distance...
Type: Posts; User: wsm junkie
Easiest way is put a cleaning rod down it with a brush, mark the rod at the muzzle, pull the brush through until the mark is on top again and mark it again at the muzzle then measure the distance...