Swap the bolts out between the guns. Run your Mklll bolt in your 22/45 gun.
VH,I put in the new firing pin, an extractor and Clark trigger about 3-4 weeks ago in my 1979 RST. I tested the pistol the same day I installed the parts and had nary a problem.
After seeing this second post about FTFs w/Fed AM I carried a 125 rounds of AM to the range yesterday. I took my Medalist and the RST for a little target practice. I ran 100 rounds through the Medalist with no anomalies. We have the annual shoot off in bowling pins in another week so I am trying to improve my time and accuracy. With rapid fire I had not FTFs with the AM.
I had planned to try 3 brands of ammo with the RST [AM, Win SuperX & CCI MiniMags]. I had to cut my session short, but I did run 25 rounds of Fed AM through the RST before I left. I was shooting fairly rapidly, reloading a magazine as I emptied it for the 25 rounds. Again, I had no FTFs or any other inconsistency.
I am running a little test with the AM, which I will put in a different post in the ammo section. I am shooting the AM in various pistols from a specific 325 round retail package to see if I have any issues. Frankly, I don't think I will.
I got about 2/3s of the way through a 100 box of CCI MMs in a Pins shoot last Monday and had a FTF with my Medalist on the 4th of 6 pins. That rather surprised me and made a quick round into a mediocre round with lost time ejecting the FTF round. In a typical string, 7 rounds are loaded for a 6 pin string allowing an extra shot if needed if a pin is missed, or more time damaging, a FTF and having to eject that round and continue the string.
I finally got around to replacing the mainspring and now the pistol with the "new style" firing pin will fire Automatch with no FTF in 100 rounds (including some from the same batch as the original test). FYI- the new mainspring measured at 2.341 and the old one at 2.269, meaning that the old one was .072 shorter. There were aprox. 50,000 rounds thru this pistol before the spring was replaced.That would work as they are the same part but would probably not prove anything as they would both have the old style pin in new or almost new condition (my wife hardly uses her 22/45). Good thought though. I will probably order a new mainspring for my Mk.3 and replace it at the end of the matches in March. As it is now, with the new/old style pin it is functioning well but it should work with the new style pin also.