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.40 Converted To .45?


RAZZ

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I recall a thread a while back discussing converting a .40 cal slide to shoot 9mm. I was wondering, can a .40 cal slide breach face be opened up properly to convert it to a .45?--And I understand that there would be more "stuff" that needs to be changed. Thanks in advance.

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It's not a fun cut, and the rest of the holes might not be in the right places (ejector, firing pin, etc), but technically I suppose it's possible, depending on the pistol design and budget available.

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Razz,

The important part is that the breechface is opened up to the proper dimensions and that is about it. You will need the .45 extractor too.

I have an SV that is fitted for 9mm and .45 (interchangeable breechface) and they both work fine with the 9mm ejector. The ejector is closer to the primer than what a normal .45 would be but it is not a major problem if you are careful. Don't bother going through the effort to replace the ejector and additional machine work on the slide.

Leo

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Just so people don't get confused, Leo, the information you give here is specific to the SV system. In a standard 1911, the .45 and 9mm/.38/.40 ejector tracks are placed completely differently, and you cannot use the same ejector for both.

For example, I built up a Limited gun with two top-ends, one in 9mm and one in .40, which easily interchange simply by pulling the slide stop. In order to put a .45 top-end on the gun, however, I would have to replace the ejector with a .45 ejector.

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  • 2 weeks later...
Just so people don't get confused, Leo, the information you give here is specific to the SV system. In a standard 1911, the .45 and 9mm/.38/.40 ejector tracks are placed completely differently, and you cannot use the same ejector for both.

For example, I built up a Limited gun with two top-ends, one in 9mm and one in .40, which easily interchange simply by pulling the slide stop. In order to put a .45 top-end on the gun, however, I would have to replace the ejector with a .45 ejector.

So, looks like my question may have been answered here. I am contemplating building a 9mm top end for my Para P16 .40. So from what I am reading all I need to do is buy/fit the slide and fit the barrel? Much cheaper than buying a new gun just for outlaw 3 gun world.

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Just so people don't get confused, Leo, the information you give here is specific to the SV system. In a standard 1911, the .45 and 9mm/.38/.40 ejector tracks are placed completely differently, and you cannot use the same ejector for both.

For example, I built up a Limited gun with two top-ends, one in 9mm and one in .40, which easily interchange simply by pulling the slide stop. In order to put a .45 top-end on the gun, however, I would have to replace the ejector with a .45 ejector.

The original question was, if he were to open the .40 breechface to accept a .45 case, what other modifications would be necessary to shoot .45. What I was trying to relay is that he would NOT need to machine the slide to accept the .45 ejector as the .40 ejector would work fine with the .45. I never insinuated that all calibers of slide could use the same ejector, just that you could use whatever ejector your currrent slide would accept with reasonable results.

Leo

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