The replacement stock from Northridge is also pretty bad. went to start fitting today and...the inletting seems nice, but the trigger-guard is off center, and there is about a 1/4 inch gap behind the tang. Looks like another "factory blemish". I decided to fit one of the keystone's instead. There was some bad scrapes on the butt from fumbling around in storage, so I decided to sand it.
I'm getting ready to cut the bolt handle recess. I've sourced some pictures from an original...in
post #28.
It looks like just a plunge with a ball bit, followed by a square notch cut at the top, from the side as well as a little from the top.
Can someone with an original please post some measurements? The width of the notch in the receiver is ~.622, and I have a 0.625 ball bit. I would appreciate
1) the actual diameter of the cut on an original
2) distance from the top of the stock to the bottom of the cut and/or to the center of the round part
3) the depth of both the lower round part, and the flat part towards the top (from the top as well as the side)
Some better pictures than what I found would be helpful too.
EDIT: I played around with a block of wood and free-handing my router. I think I have the correct technique. A 5/8 straight bit from the top to produce a notch, then the same straight bit on the side to get a notch, and finally changing to a 5/8 ball, plunge to complete on the side. Now I just need the depths...and some more practice.
EDIT: some good pics here
https://www.milsurps.com/showthread.php?t=35919