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I turned my brass bushings on the lathe.

After cleaning out the slots with a toothpick, I use magna-visors and evaluate the best fit for the screw in front of me. My experience is that the yoke screws have been 180-2/ 3 / 4. 150-3, and some 150-1. Your 210 options seem too wide and will ream the margin of the counter sink in the side...

One can never have enough hardened punches on the bench. When a parallel pin punch bends, don't throw it away; cut it short, heat harden and temper it, a short starter punch you now have. I fabricated a whole set in this manner, each one with a story and reminder not to proceed like that again...

When the safety is absent, the frame apertures have asymmetric plugs that fill the gaps.

It appears the hammer rebound seat has been removed on the shiny example.

In 2009, Massad Ayoob penned a comprehensive Treatise on this issue. A good read. https://www.backwoodshome.com/blogs/MassadAyoob/internal-gun-locks/comment-page-1/

It is my understanding that in the remote past, S&W revolver forcing cone angles were 18 degrees; modern production barrels have a 11 degree included angle, 5.5 deg off the bore axis. The 18 deg chamfer has a slight accuracy advantage with jacketed bullets. The 18° chamfer has been used quite...

....... I have been using Grab-It extractors for years, have not failed yet to remove a typical gunsmith sized fastener, usually a hex head stripped. Cordless drill, use reverse mode for drill & extraction. Done. Replace with torx style or real plug screw from Brownells or Hillman. You can buy a...

No mystery. The trigger was pulled or pushed during your "administrative" magazine maneuver. The M&P9 trigger bar movement is required to depress the independent spring-loaded striker blocking plunger and simultaneously release the trigger bar-sear engagement, which then allows the cocked...