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Auto Mag Corporation Model 180, starting as one man's quest to win a bet that he could make a working .44 Magnum automatic pistol.
Doesn't quite make that, instead invents a new cartridge, the .44 Auto Mag Pistol, in every sense a rimless .44 Magnum, the parent case being the .308 Winchester, but the resulting pistol does work, and exhibits the right ballistics.
These pistols operate on short-recoil, and use a rotating bolt to lock the breech, rather than a typical slide. Proprietary ammunition is always a challenge in the market though, and finances didn't quite work out, though the pistol was revived again and again, resulting in a couple of thousand guns produced each time.
Not perfect though, these pistols do batter themselves kinda roughly at a few thousand rounds, which is something that's apparently being addressed with the new 21st century revival of the Auto Mag, it will be available in .44AMP, as well as .45 Winchester Magnum, which in my opinion is a far better choice, as it's far easier to come by.