Jim, The 9mm won't blow apart the casing if the pistol has been designed for its use in that manner... remember that virtually all 9mm submachineguns are blowback... and this cartridge has also successfully been used in blowback pistols... the first example that comes to mind is tha Astra 600 which was also pressed into service by the Germans in WW2.
This type of 9mm blowback pistol would require a "hefty" recoil spring... but I assure you that they function safely.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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