SGW Gunsmith
Blackhawk
For lack of a better term, or part name, 'cause this part is not listed in the manuals schematic, I'll call it a "lug bumper" until I'm corrected.
This was not a really well thought out addition to the Ruger Mark IV as to what it's supposed to do, I think. This little black "bumper (?)" has the consistency of chewed chewing gun, and you'll notice the tiny hole in the top of the bumper. A little steel ball goes into that hole so that when you replace the gummy bumper, the punch used will not poke through the soft rubber bottom of the alleged bumper. This bumper has survived around five re-assemblies of the upper, so I was told by the owner.
I've been experimenting with various durometer readings involved with plastic round stock when attempting to make a longer lasting bumper.
Yes, I know, you can probably call Ruger and get a replacement, and I'm sure it will be the same as the one to be replaced, so, ask for a dozen or so of the originals to get you through the month. :wink:
This was not a really well thought out addition to the Ruger Mark IV as to what it's supposed to do, I think. This little black "bumper (?)" has the consistency of chewed chewing gun, and you'll notice the tiny hole in the top of the bumper. A little steel ball goes into that hole so that when you replace the gummy bumper, the punch used will not poke through the soft rubber bottom of the alleged bumper. This bumper has survived around five re-assemblies of the upper, so I was told by the owner.
I've been experimenting with various durometer readings involved with plastic round stock when attempting to make a longer lasting bumper.
Yes, I know, you can probably call Ruger and get a replacement, and I'm sure it will be the same as the one to be replaced, so, ask for a dozen or so of the originals to get you through the month. :wink: