I'm kinda talking out my ass right now sense I really haven't laid everything out yet to check things out more.
But in the back of my mind I can't really think of any major issues that would prohibit building the PPs43 into a 45 ACP other than maybe the mags, recoil spring and possibly the barrel trunnion. Of course, also finding a 45ACP barrel blank to use.
The 45's drop right into the 43 mag just fine but tend to nose dive when coming out, so maybe just tweaking the front of the feed lips to allow the cartridge to tip up more to feed right or worst case, a feed ramp on the replacement barrel may be required,,,don't know yet????
CUP won't be any issue sense 45 is only in the 21-23 CUP range and the x25 is all over the charts running from 31-40K+ average CUP. So the 43 will be way stronger than required and one could probibly load the 45's up to ++P load specs with no danger to the gun. I'd probably have to lighten up the recoil spring some sense it may not eject right otherwise with the decreased pressures. And OAL is 1.377 with the x25 and 1.258 with the 45, so no issue with length I wouldn't think. The feed lips will obviously need some adjusting but that shouldn't be an issue either. The ejection port should be plenty big enough also, the only thing I could possibly think of that may be an issue in the grand scheme of things, would be the trunnion walls being to thin to accommodate the OD of the 45 barrel. But with a stronger alloy steel and the lower pressures with the 45 cartridge I don't really expect any issues there either.
Can anyone else think of any pitfalls I might run into or might want to consider? Lots of you guys here got a Hell of allot more experience than I with semi's,,,I'm a bolt gun guy and semi re-builder pretty much so lots of this semi caliber conversion stuff will be all new to me when it come to changing a platforms caliber this drastically. 30 cal to 45 is a pretty big jump.
I really think a pps43 would be a petty neat conversion though, especially with a 16" barrel and a functioning folder. Something like that would make a real sweet truck/4 wheeler gun. Ya,, the x25 is a better caliber in many respects, but a 45 PPs43 would make an interesting carbine I'd think, especially sense I've already got a 43 in x25.
Any thoughts on this guys? Ya'll got me thinking out of the box right now on this conversion possibility.
Maybe I'll PM Will on this idea sense this type thing is right down his ally and something he may have run into already.