Quote:
Originally Posted by Model520Fan
As you probably know, that extra-power mainspring is closely related to serious functional problems, so if you intend to shoot that thing, or even dry-fire it, it would probably be good to swap it out sooner than later. Bob Vivas had a fairly complete discussion of the issues here some years back.
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This is correct, the extra power mainspring made the size of the hammer stud (hammer pin) hole in the sideplate more critical. If you notice on the OPs picture the silhouette inspection stamping is on the yoke cut out which means it passed the inspection with a go no go gauge to ensure the side plate hammer stud hole was within specification. I posted pictures of the go no go gauge and the actual NY-1 and Silhouette dies used to stamp the guns at the range awhile back. Ultimately all the guns were removed from service.