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They couldn't, since it is a blow back design it would blow up
. There is not delayed lock up to allow the gases in the barrel enough time to leave through the muzzle. So anything with higher pressure than a .380 would release gas through the ejection port and into the magazine, and that would be bad.
 

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Colt Mustang is a great little gun, I have never owned one though. I looked up in one of my books, Walther did make a PP in 9mm that was a straight blowback, it had a huge slide and still had trouble with part breakage, though they didn't say what parts broke. It looked like it used about a 5" barrel.
 
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