Despite my years served at the trigger end of air gunning (lol), Co2 BB pistols are pastures new for me (got hooked after playing with my Son's Steyr A1-M9 during the summer), and subsequently I/we now have a BB firing Umarex Peacemaker, too, and I have to say I/we find it faultless and fun ...
This in mind, then, any info on the aforementioned condition as flagged (barrel bulging ??? ) will be appreciated, as (a) not ever heard of anything even remotely similar, and (b), as an engineer, without the application of heat, can not fathom how said condition could manifest? Cheers: G.