I really can't understand why you're still fiddling around with that fubar'd barrel. The only way it could possibly be fixed so it would function properly is to replace the gas cylinder......providing the bore/barrel has'nt been ruined by being welded on multiple times. Welding on something that has to stay perfectly straight is no easy task, and it distorts the metal, causes warpage and changes it's structural integrity, not to mention putting it under loads of stress. Likely, the bore has a tight spot directly under the welded area or will be warped or both. Go with the original idea and rebarrel it or take everyone else's and scrap it and get one you don't have to worry about a barrel rupture on every time you pull the trigger. Theres a reason the originals have the gas cylinder swaged in place, IIRC Iver Jonnson and others silver soldered theirs on and thats the reason the weld cracked, impossible to weld over that stuff and get it to hold up. JMHO
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