Can you scale down a firearm to make an identical looking firearm that fires a different round?
Like, could you make a smaller version of a 1911 that fires 22lr instead of .45 by just scaling all the parts to the 22lr?
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More changes would be needed than direct uniform scaling - .22lr is rimfire, whereas .45acp is centerfire, for example, and their aspect ratios are different. The mass and strength of uniformly scaled-down parts also might not match the recoil and pressure provided by the smaller round, and might result in failure to reliably cycle the action or the gun bursting if the mismatch is too much.