I have begun a project to convert a Ruger .22LR "Standard Auto" MKII Pistol to Center Fire and .25ACP Cartridge use.
The MKII Pistol was purchased used at the end of July 2018 and I received possession about two weeks later in accordance with California Laws and Regulations.
It came to me as a 4-34" Barreled pistol modified for target use with a Volquartsen molded Grip, with thumb rest and hand 'heel' support one piece wrap around.
This November I sent the Receiver-Barrel assembly, the Bolt assembly, a MKI 'takeoff' barrel for a measuring sample, a roughly 8" long Remanent L.W. Cr-Mo Alloy steel .25 Auto/6,35 Browning Pistol Barrel Blank, and my custom 'Straight Cylinder' Finish Chamber reamer with .2795' Body diameter to John Taylor Machine in WA for machining a new roughly 8" barrel and fitting it to my MKII Receiver.
John Taylor also said he would look into converting my Bolt assembly to Center Fire use.
John notified me via PM that he has assembled my parts onto his Grip frame and test fired my bolt, receiver and New Barrel.
John also reported he used Carbide End Mills to make the CF Firing Pin hole in the Hard Bolt.
Now I need to get onto the part of making a New Magazine to fit the Ruger grip frame and feed angle.
So far it looks like Beretta 'Bobcat M25' 8-shot or 9-shot magazines may be a good donor for my purposes. Probably need two or three cut up and welded together to make one long body Mag to properly feed and fit the Ruger Pistol as Ruger uses a Bottom rotating catch to hold the Magazine in the pistol, so magazine Length is critical to function.
Beretta "950" Model magazines also may be usable with the same length problems.
Both of these have a semicircular front edge and a square rear edge that will fit in the Ruger Grip frame.
A Beretta JM25 .25ACP Mag. with its more square front edge, does NOT fit.
Chev. William