On Backorder

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. O-Ring installed on barrel threads to secure thread protector when firing.

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.

Current Model * 

Factory Barrel Length * 

Threading Options * 

Barrel Fit

Barrel Finish * 



Barrels listed as “In Stock” are machined per order specifications from customer.  Barrels are made drop in or fitted, cut to length, and threaded custom per order.  For this reason, please allow 2-4 weeks for your order to be filled and shipped.  If a barrel is listed as “On Backorder”, it means we are currently manufacturing a run of these barrels and do not have any in inventory.  You may place an order, which will place you on our backorder list, and we will fill and ship your order as soon as we are finished manufacturing.


For instructions on sending your slide, please click here.
Slide only needed for fitting.
Order number must be visible on outside of package when shipped.


We now offer custom PVD finish options.  Walther barrels are now available in our standard black finish as well as silver and copper PVD coatings. PVD (Physical Vapor Deposition) coatings are an extremely hard coating that offer aesthetically pleasing colors and increased lubricity.  Our CrN PVD coating is a silver finish similar to that of stainless steel.  Our TiCN PVD coating is a satin copper.  For colors, please see images at the top of the page.  PLEASE NOTE THAT PVD FINISHES ADD APPROXIMATELY 2-3 WEEKS TO LEAD TIME.


-Twist: 1/16
-Rifling: Conventional, button rifled
-Material: 4140 Gun Barrel Certified Steel
-Hardness: 40-44 HRC
-Crown: Recessed 60 degree crown
-Thread Protector: Included at no charge (1/2-32, 1/2-36 excluded)
-Includes O-Ring on barrel threads to secure thread protector while shooting

Additional information

Current Model

PPQ M1, PPQ M2, P99

Current Barrel Length

4.2” Factory Full Size, 5” Factory Full Size, P99 Compact

Threading Options

1/2-28 [+$49.00], 1/2-32 [+$64.00], 1/2-36 [+$64.00], 13.5x1MM LH [+$52.00], 9/16-24 [+$49.00], 14.5x1MM LH [+$52.00], .578-28 [+$49.00]

Barrel Fit

Drop In, Fitting Required (Slide Must Be Sent In) [+$45.00]

Walther Factory 9MM Magazine Quantity

None, 1 Walther P99/PPQ 9MM Magazine (15 Rounds) [+$34.99], 2 Walther P99/PPQ 9MM Magazines (15 Rounds) [+$68.99], 3 Walther P99/PPQ 9MM Magazines (15 Rounds) [+$102.99], 1 Walther P99 Compact 9MM Magazine (10 Rounds) [+$34.99], 2 Walther P99 Compact 9MM Magazines (10 Rounds) [+$68.99], 3 Walther P99 Compact 9MM Magazines (10 Rounds) [+$102.99], 1 Walther PPQ 9MM Magazine (10 Rounds) [+$34.99], 2 Walther PPQ 9MM Magazines (10 Rounds) [+$68.99], 3 Walther PPQ 9MM Magazines (10 Rounds) [+$102.99]


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