Hi Tom, You at Fort Campbell??? If I had an old system that worked great I would not attempt to "fix" anything. Now if you buy a caliber conversion of course do the upgrade (I think all the conversions HAVE the new system). I could not see "upgrading" my .223/5.56 barrel as it WORKS. Go to the robarms site and look in accessories and caliber conversions. Sounds like you have a fine XCR, and it is reliable for you. Glad to have you as a new member. ;D