OK guys, I need some factual info. Not armchair lawyer stuff. Facts backed up by documentation.
There are alot of aluminum barrel extentions being sold for the M92 and other krink variants. Most of which are solely blind pinned and not welded. The way I read it was that "they are to be welded, silver soldered with 1100 degree solder, or blind pinned and welded"
No mention of a blind pin that cannot be removed without machining.
Has the manufacturers of these designs had them approved as barrel extensions without welding or solder? If so, do they have a letter from tech branch stating that? These are questions needing some factual answers. If these are not attached by an approved method, they WOULD be consider an illegal SBR, and some unknowing builder would go to jail for an unscroupulas manufacturers negligence.