.40 to 9mm conversion

[gaston's nine]

I'm sure this has been addressed, but here it goes. Can you replace the .40 barrel and the magazine in the USPc with 9mm parts? I have recently been given a .40 that was a victim of Hurricane Ivan, and was left to rust in a box. I couldn't believe that my buddy didn't even try to clean it up. He just assumed that it was totalled, and put in a box. Over a year later I come along and we are talking gun stuff, and he mentions the H&K. He gives it to me and says good luck. I was able to break it down, and there is some rust inside and out, but for the most part, a good cleaning, and a good lube, and this H&K will be a shooter again. I was looking at the barrel, and I think it will clean up, but if it doesn't, I was wondering if I could swap to the 9mm stuff. All my other handguns are 9mm, and I have plenty of rounds to burn up. I'm not saying that I don't want to keep it a .40, but we all know that the 9mm rounds are cheaper at the range. Thanks for the help.

Keith

[LGCubana]

You would need a conversion barrel. I've yet to run across a gun manufacturer that makes a .40 model that will take their equivalent 9mm barrel.

[Alphaman]

Is there and HK .40 to 9mm conversion barrel available?

[d-Gman]

just call the factory... but its a weird case.

[flyandscuba]

I'd think you'd need a new slide too -- as the breech-face is different between a .40 and 9mm. For sure the extractor would be different. You could easily swap to .357 Sig, if you just wanted a 9mm projectile -- as the breech-face and extractor (and magazine) are the same between the two cartridges.

[MarcDW]

HK does not make barrels like this.
For the money a barrel like this would coast you, you can pay the extra $$$ for the .40 ammo!