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Looking to convert your Walther PPQ or P99 .40 S&W to 9MM? Look no further. With just the swap of a barrel and magazine you can start shooting 9MM out of your Walther .40 S&W. No other parts necessary.
Made from high strength 4140 Chromoly Steel, hardened to 40-44 HRC, this conversion kit will transform your Walther PPQ or P99 .40S&W into a 9mm in a matter of seconds. We have manufactured these barrels to the highest standards to ensure our customers have the greatest quality and most accurate barrel on the market.
A Walther PPQ/P99 9mm magazine MUST be used in order for the conversion to function. Walther PPQ/P99 .40S&W magazines WILL NOT WORK. We no longer carry magazines, but they can be purchased elsewhere at gunmagwarehouse.com and promagindustries.com.
M. Sams –
I bought one of these barrels several months ago. I have both a P99 and a PPQ all bought LE surplus brand new, but I wanted to shoot 9mm. The Jarvis barrel fits both my Walthers better than the barrels that came from Walther! With the slide closed, if I try to move the barrel at the chamber, I can get a distinct click from the Walther barrels. I can’t budge the Jarvis conversion barrel. I merely ordered mine “drop in”. Now I’m considering ordering a .40 cal barrel to replace the nearly new Walther barrels!
Ed –
Fixed Walther’s laziness.
I got this barrel because my P99 is unreliable in .40. It randomly drops the mag under recoil with a verity of ammo and different shooters.
Jarvis kept me updated every step of the way. When I got the barrel I was concerned because it doesn’t come with a recoil spring. However after putting a few mags through it I quickly realized that Walther had put a 9mm spring in my .40.
I’ve had this barrel for a few years and have never had any problems with it.
Timothy Kelly –
For years my P99 AS has functioned outstanding. Was allowed to carry it for service and having carried a 686 for 25 years I was use to the trigger pull. We were told “wheel firearms were no longer for service and was given a choice for a glock, sig and walther. Tested all the firearms recommended and well it was a toss up between sig and walther. They are all excellent firearms but only two I liked for the trigger pull and for staging was sig, walther. My choice was the P99 AS, as it felt more like my 686 trigger and I felt secure on the pull. The de-cocker also made it a no question either. Well this old patrol flat foot has retired, and 40s&w was more than I needed, so a Jarvis barrel was the choice. No mistake, it fell into the firearm and now my trips to the range are more fun with a low recoil. My only wish I could have had it back 40 years ago, would have made carrying a lot lighter.
D.W. (verified owner) –
Like Ed, I owned a Walther P99 in 40 cal that regularly dropped magazines during normal firing… all 4 factory magazines, and it happened with different shooters, too. I decided to purchase the conversion barrel from Jarvis to fix the problem. This was a MAJOR improvement and forced my 40 cal P99 to abdicate the throne as my safe queen. I could hit the target with the 40, but the heavier slide, combined with the substantial thickening of the conversion barrel wall (almost a bull barrel!) increased the inherent accuracy of my pistol. I chose the barrel fitted to the slide option; nice and snug! I also replaced the extractor with the 9mm part; Jarvis says you only need the barrel and the magazine, but I felt a little better replacing the extractor, too. Had to wait about 2 months, but Jarvis kept me informed throughout the production process and came through, delivering the promised product. Thanks! No regrets from this reviewer. Well worth the price.