Charlie
All 10 of my extra barrels have been gotten 2nd, hand and i have only had a fitting problem with 1 , that was a eazy fix , just needed to remove a small amount of metal from the underlug .
It helps that i have more than one frame to work with , so if it does not fit one then it may fit another . check the barrel fitting inst. in the FAQs , its a snap to do .
stimpy