What exactly did I just buy? how to handle a cracked gas piston assembly?

[Bruce McAskill]

The gunsmith can say the welding will work but it won't. It's a high stress point. The government even gave up on trying to get cracked gas cylinders welded or brazed and none of the attempts worked. The only fix is a new barrel. Most all of the cracked gas cylinders are due to someone over tightening the castle nut and causing the cylinder to crack. It is very rare that a piston or gas cylinder needs attention to the point the nut has to be removed and the piston removed. That is why only ordnance people were issued the proper wrench to remove the castle nut.

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