.22LR Sub-Caliber Barrel Insert

[sheepherder]

Originally Posted by Lugerdoc

SH, In my accumulation of PO8 parts, I've picked a few different variations of standard PO8 breech blocks and firing pins that have been modified for use with rimfire .22lr. Available cheap, starting @$25 each. TH

Tom - PM sent.

In the meantime, I've faced the breech end of the insert to 9mm case length and reamed the chamber to .22RF.

Just for S&G, I loaded a fired case into my barrel insert and 'fired' it with all-Luger components in place. Just to make a firing pin impression.

Whoa!!! That is one big firing pin strike!!!

I don't have a needle-point verniers, but my 1/16" square-end verniers shows a .024"+ deep dent!!! That's more than my 9mm Parabellum firing pin strikes!!!

I don't want to do any 'real' test-firing until it's threaded and a nut secures it in the barrel...Just in case...