A big thanks to you barrel switching researchers
I am very happy to continue to read articles about barrel switching.
When I finally took the slide off my 40 cal glock, and instead of pondering why it took so much pressure to push a 40 under the extractor - I pushed a 9mm under the extractor and it went perfectly. (forehead slap)
When my 40 cal Glock was new and the experts (other places) were telling me not to try to feed the first shell in slowly (let the slide slam closed) - and other experts on bullets and kabooms were saying how it can loosen the bullet head feeding it fast.
And then my instincts that are based on my father being an automobile mechanic at a time when many parts were fitted. I was determined to find out why the 40 glock feeds slam bang, and fix it or sell it.
I had read too many stories about limp wristing jams, particularly on the second to last cartridge in chamber. I noticed in mine the second to last cartridge was the least supported and teeter tottered on only one cartridge below it. Which led me to eventually notice how the cartridge was not sliding up under the extractor easily. Now my opinion is that the limp wristing FTF jams have more than one issue.
I got spoiled years ago by my S&W model 19. You can of course switch back and forth from 357 to 38 special with any 357mag. At minimum one runs a bore brush through the cylinder after lots of 38 special in case any powder ridge is building up at end of where the 38 special shell extends in the chamber.
Now if I could find a parts supplier that has an extractor for my 40 cal glock that was built for 40 cal shells only, then I would be happy.
As it sits with me right now I am going to buy a S&W in 45 caliber so I know that it is what it is.