What's really required to convert a .40 Glock to a 9mm Glock?

[DestructoJr]

Having watched some 9mm drop-in conversions work OK and a couple choke, IMHO you need a 9mm gun to get the 99.99% reliability I expect.

I nailed down a S&W engineer (who also is an IDPA match guy) regarding their M&P .40, and he said .357 is OK, but the 9mm is just enough off to be questionable.

The reason you can drop in a .40 barrel in a .357 or vice versa is they are the exact same case...the .357 is a 9mm bullet in a necked down 40 cal case all you need is the new barrel extractor breach face all the rest is the same. The 9mm is a small case with different dimensions totally...so the firing pin strike area might not match up to the primer depending on what kinda gun you have

 

[ssgrock3]

without getting into the science of if it works or doesn't. I can tell you I have done it with a couple federal conversion barrels....they were luck of the draw. (federal) and great success with lone wolf conversion barrels and magazines only. I have not changed any other parts and have had no problem. just my .02 and experiance. Great way to plink some 9mm with a glock 22.

 

[Traxxis]

No....

dang... better now???

Sheesh, a guy can't get a break around you guys!

 

[tm8634]

Obviously I'm not much of a Glock guy...

you know you are, you just havent came out yet...

 

[JD8]

Lone Wolf claims that you don't have to change any other part, other than mags for their .40 to 9mm conversion barrels. KKM conversions are supposedly the same way.

I have no experience with either for 40-9.

 

[B96brig4CC]

I have done a barrel swap on an M&P 40c with a storm lake barrel and factory 9mm mags. The barrel took a little bit of milling to get it to function flawlessly. The hood of the barrel was a little thicker than spec and had to be milled down slightly so that it didn't jam with the underside of the slide when the slide came back. After getting it into spec in that sense it functioned flawlessly with no other mods or parts needed. I spoke with Mike at Accurate Iron about it prior to purchasing the barrel and there was no mention of other parts needing to be replaced. In the first outing with the new barrel and mags is never skipped a beat in 300 rounds.

All that to say, all you should need is a conversion barrel and mags.

Bart

 

[ldp4570]

9MM;
Case length, 19.15MM
Rim Diameter, 9.96MM
Rim thickness, .90MM

40SW;
Case length, 21.6MM
Rim Diameter, 10.8MM
Rim thickness, 1.4MM

 

[ttown]

Just get the lone wolf barrell. I've had mine for about 5 years now and it works great. You can buy some mags but if your just target shooting the .40 will work fine for paper. Really I've used my conversion at USSA classes and never had a problem at all but I do have a G19 and used those mags.

 

[ez bake]

Just get the lone wolf barrell. I've had mine for about 5 years now and it works great. You can buy some mags but if your just target shooting the .40 will work fine for paper. Really I've used my conversion at USSA classes and never had a problem at all but I do have a G19 and used those mags.

Yes, .40 will work for target shooting - and it will be more expensive than 9mm

 

[NikatKimber]

Yes, .40 will work for target shooting - and it will be more expensive than 9mm

I think he was saying that the .40 mags will work for 9mm shooting if you're just at the range.