I've heard that doing this is nigh impossible, due to the fact that the barrel diameter is just too large on the .45 GAP. What's the primary issue here? The extractor? I have a wack-ass idea about that.
I guessed as much. So here's my really crazy idea. What if you had a barrel in which the bore axis was offset from the barrel axis so that the cartridge sat closer to the extractor than the ejector? It would look REALLY wierd, but I think you could get it just enough so that the extractor would have enough tension, the firing pin would strike, albeit off center, and the ejector would just touch the 9mm case.
Why, you ask? Because its there. In a perfect world, you could convert any gun to 9mm with a push of a button.
Actually, no, in a perfect world, .45 GAP is the most common cartridge.
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