NO. You have to get the conversion barrel...something to do with the size of the feed ramp or something...the exact reason escapes me but I know you can't just use a G19 barrel because I had asked the same question before.

However, you're right on the mags...once you have a conversion barrel you can just use G19 mags.

If you don't like Lone Wolf (which I don't personally, when I get a conversion barrel it won't be one of theirs, simply because I don't want that goofy looking wolf on the top of my barrel lol), Storm Lake and I believe Bar-Sto also make conversion barrels.

Thanatos is correct; you must use a specially-made barrel to safely fire 9mm ammo in a .40 caliber Glock. The problem is the vertical cutout in the breech area of the slide. The .40 cutout is wider, as the .40 cartridge case is wider than a 9mm. If a stock 9mm barrel were used, it would fit too loosely in the wider cut slide, and could cause lock-up problems or extraction difficulties (if the barrel had too much side-to-side movement at the rear, the extractor might slip off the cartridge's rim). Because the parts would not fit together correctly, it is quite possible that the barrel and/or slide would be damaged/battered or by recoil forces.

There is another method that uses all Glock parts, but it is much more involved and expensive. You would need to get a complete 9mm G19 slide and barrel assembly, and a 9mm ejector housing. Then you'd have to learn to change-out the .40 caliber ejector housing for a 9mm housing in the frame, including swapping the connector into the new housing, and finally, install the 9mm slide assembly.

That's probably why the conversion barrels are so popular.

Thanks for the quick responce men.

It's funny how we think alike.........

My first thought was how could I get that stupid looking wolf off the barrel.

For an additional $14.95, they will hide the logo and caliber markings by applying them to a not-normally-visible part of the barrel.

Lone Wolf Distributors - Product Detail - LWD Blind Marking - $14.95

Not saying it's a good or reasonable option, but it's an option...

+1 for the Storm Lake barrels. I use a 9mm and a .40 S&W in my G-32. You also have the advantage of being able to fire un-jacketed lead rounds in the conversion barrels.

Got me a good grinding wheel.

I'll loose the damm Wolf first thing.......