I've decided to replace the plastic mag catch with the traditional S&W detent retained threaded magazine button. I've ordered the parts to do so from the 45x6 family of pistols.

• 107690000 MAGAZINE CATCH (RH)
• 069350000 MAGAZINE CATCH NUT
• 068290009 MAGAZINE CATCH PLUNGER
• 105790000 MAGAZINE CATCH SPRING

My question is for anyone who has one of these 4506/4516/etc guns apart on their bench. I need to know the depth of the detent bore.

I borrowed a 659 and checked out it's detent bore to find it is 0.102" in diameter by 0.580" deep. The detent it's self is 0.100" and offset from the centerline of the mag catch by 0.160"

I've not drilled for the offset in my jig below, but you can see I'm one drill operation away from having a jig to do the job.




There doesn't seem to be any magic on the clocking of this detent bore other than the obvious locations where it would break out of the frame. They seem to be on a parallel with the grip angle (75 degrees) and have been placed by S&W at 12 and 6 o'clock (more commonly). Is there any preferred clocking for such a change?