Merry Christmas to all. I sold my West Hurley M1A a number of years ago which I still regret. I have picked up a Kahr 1927 which I am in the process of SBR'ing. It is my understanding that the interior receiver dimensions (bolt travel) is different on the semi and SMG guns. I am contemplating machining some of the excess meat out of the back of the Kahr so I could have more bolt travel, and lower the incredible spring load they have on this beast.
Could I impose on someone to take some measurements for me. On your 1927 or M1 with the upper off the lower, and the bolt group still in - how much free travel do you have to the interior back wall of the upper? So measured from the back face of the bolt to the front edge of the bolt cavity?
I appreciate the help.