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unspellable · 09-16-2005, 05:21 PM

The 7.63 mm Mauser is just too hot a round for a blow back, even the 7.65 mm Parabellum is viewed as too much for a blowback. My guess is 32 ACP. But then, who knows?

The recoil or breech spring is in the barrel shroud? is it in tension instead of compression? Or does the entire upper go all the way back? If the entire upper is a solid piece with the breech block inclusive it would have enough mass for a more potent cartridge. (The key to how hot a cartridge a blowback can contain is not the strength of the breech block spring, but rather the mass of the breech block.)

09-16-2005, 05:21 PM	#13
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 768 Thanks: 0 Thanked 19 Times in 11 Posts	springs The 7.63 mm Mauser is just too hot a round for a blow back, even the 7.65 mm Parabellum is viewed as too much for a blowback. My guess is 32 ACP. But then, who knows? The recoil or breech spring is in the barrel shroud? is it in tension instead of compression? Or does the entire upper go all the way back? If the entire upper is a solid piece with the breech block inclusive it would have enough mass for a more potent cartridge. (The key to how hot a cartridge a blowback can contain is not the strength of the breech block spring, but rather the mass of the breech block.)