I cannot see that it would make any difference whatsoever who made SAS type bolt parts. This has no effect whatsoever on the operating system.
The Tech's comment about an open bolt design being acceptable reflects the recent approval of the BD-38 and BD-3008, and the continuing non-restricted status of Gevarm, Voere and other similar .22 rifles.
As we are aware, it appears that a Mk. III type gun has been made which seems to have an intact original trigger mechanism, and which functions semi-auto because the original bolt has had its sear bent built up to extend across the bolt. It does not matter if the selector is set for repetition or auto, the bolt will hit the tripping lever, and semi auto fire will result. Of course, if an unaltered bolt were to be dropped in, the gun would be selective fire. I may of course be wrong (my wife suggests that this is the case, from time to time), but I would suggest that this semi auto conversion system would be laughed out of the examiners' lab. The reuse of an original magazine well is another issue.
