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Originally Posted by Hal
Is there such a critter as a multi caliber blowback?
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The HK HK4 was offered as a 4-caliber kit with .22LR, .25 ACP, .32 ACP, and .380 ACP barrels. It was also offered in 2-caliber centerfire/rimfire combos, most commonly .22LR and .380 ACP. The pistol incorporated a mechanism to switch the firing pin position as needed for rimfire and centerfire, although I don't recall the design details.
Additionally—although factory caliber-change kits may not have been offered—many blowback pistols offered in both .32 and .380 with barrels that aren't fixed to the frame can be switched between calibers easily. For example, the Beretta 81 and 84 can exchange calibers with a simple barrel and magazine swap; the recoil springs are actually the same!