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I wasn’t happy with the rear sight on my PPQ .22. As delivered, my pistol was shooting high. The vertical adjustment screw on my initial sight felt extremely notchy as I tried to adjust the group lower, then the screw stripped out. I returned the slide to Walther and they fixed me up with a new sight. Even with the screw bottomed out on this sight, it was shooting high. I use the pistol for steel challenge completion. Many competitors have been switching to optical sights for their pistols, so I began searching for a way to mount an optical on my .22. Here’s what I ended up with and some photos.
I couldn’t find anyone making an optical mount specifically for the PPQ .22. However, I’ve read a few messages in the forum here that indicated a S&W M&P rear sight fits the PPQ .22. Outerimpact makes a dovetail plate for the S&W M&P that will work with a variety of Red Dot sights (as shown on their product information page). The item is the Red Dot Adapter/Mount for Smith & Wesson M&P Pistol — M.R.A. I bought mine on Amazon.
The stock rear sight on the PPQ .22 is a loose fit. Once the hold down screw is loosened, the sight comes out easily. My advice is to remove the screw completely and use care removing the sight so as not to damage the very small spring under the sight blade. My caliper is old and crude, but it measured the width of the bottom of the sight at 1.15 cm. The Outerimpact dovetail mount measured slightly wider at about 1.16 cm. It fit in the sight groove on the slide easily by hand. The optical mounting plate attaches to the dovetail mount by two Torx flathead screws that hold the dovetail mount securely in place. If you want to attach one of the supported red dots, check the instructions on the Opterimpact product page and you’re done.
In my case, I wanted the Holosun HS507C. Holosun says that sight fits a Trijicon RMR mount. The Outerimpact mount supports the Trijicon RMR. The problem is, the screws supplied by Outerimpact with the mount for the Trijicon are 6-40 x 0.406” which, when used to try and mount the Holosun, are too long in that they come out below the mounting plate. Holosun includes mounting screws with the sight but they are 6-32 rather than 6-40 and won’t work. The proper screw must be long enough to engage most of the threads in the screw hole without extending past the bottom of the plate. Outerimpact told me that even the slightly shorter screw you find at a hardware store may be too long.
A 6-40 screw is hard to find locally. The screws I ordered online were from Fastenal, 6-40 x 3/8” (0.375”) Hex Drive Black Oxide Finish Alloy Steel Flat Socket Cap Screw, part number 24541. That screw fit just about perfectly.
I test shot the setup today and surprisingly, it was very close from the get-go. The target shown was at 12 yards. It was a bit high, so I adjusted it lower and put a few more rounds on it.
Don't forget the blue threadlocker on all screws during final assembly.
Stock sights on gun
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Stock sights off gun
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Outerimpact mount package
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Mount items for installing on PPQ .22
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Mount with pins in plate
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Dovetail mount in PPQ .22 rear sight groove
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Mounted plate side view
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Mounted plate top view
https://static1.squarespace.com/sta...0d1e5/1550891609381/_7202641.jpg?format=2500w
Holosun HS507C package contents (included mount for picatinny rail)
![]()
Holosun HS507C sight
![]()
Fastenal, 6-40 x 3/8” Hex Drive Black Oxide Finish Alloy Steel Flat Socket Cap Screw, part number 24541
![]()
Fastenal 6-40 x 3/8” screw fully seated as seen from the bottom
https://static1.squarespace.com/sta...ede59/1550891610520/_7202679.jpg?format=2500w
Sight fully mounted
![]()
12 yard test target
![]()
I couldn’t find anyone making an optical mount specifically for the PPQ .22. However, I’ve read a few messages in the forum here that indicated a S&W M&P rear sight fits the PPQ .22. Outerimpact makes a dovetail plate for the S&W M&P that will work with a variety of Red Dot sights (as shown on their product information page). The item is the Red Dot Adapter/Mount for Smith & Wesson M&P Pistol — M.R.A. I bought mine on Amazon.
The stock rear sight on the PPQ .22 is a loose fit. Once the hold down screw is loosened, the sight comes out easily. My advice is to remove the screw completely and use care removing the sight so as not to damage the very small spring under the sight blade. My caliper is old and crude, but it measured the width of the bottom of the sight at 1.15 cm. The Outerimpact dovetail mount measured slightly wider at about 1.16 cm. It fit in the sight groove on the slide easily by hand. The optical mounting plate attaches to the dovetail mount by two Torx flathead screws that hold the dovetail mount securely in place. If you want to attach one of the supported red dots, check the instructions on the Opterimpact product page and you’re done.
In my case, I wanted the Holosun HS507C. Holosun says that sight fits a Trijicon RMR mount. The Outerimpact mount supports the Trijicon RMR. The problem is, the screws supplied by Outerimpact with the mount for the Trijicon are 6-40 x 0.406” which, when used to try and mount the Holosun, are too long in that they come out below the mounting plate. Holosun includes mounting screws with the sight but they are 6-32 rather than 6-40 and won’t work. The proper screw must be long enough to engage most of the threads in the screw hole without extending past the bottom of the plate. Outerimpact told me that even the slightly shorter screw you find at a hardware store may be too long.
A 6-40 screw is hard to find locally. The screws I ordered online were from Fastenal, 6-40 x 3/8” (0.375”) Hex Drive Black Oxide Finish Alloy Steel Flat Socket Cap Screw, part number 24541. That screw fit just about perfectly.
I test shot the setup today and surprisingly, it was very close from the get-go. The target shown was at 12 yards. It was a bit high, so I adjusted it lower and put a few more rounds on it.
Don't forget the blue threadlocker on all screws during final assembly.
Stock sights on gun
Stock sights off gun
Outerimpact mount package
Mount items for installing on PPQ .22
Mount with pins in plate
Dovetail mount in PPQ .22 rear sight groove
Mounted plate side view
Mounted plate top view
https://static1.squarespace.com/sta...0d1e5/1550891609381/_7202641.jpg?format=2500w
Holosun HS507C package contents (included mount for picatinny rail)
Holosun HS507C sight
Fastenal, 6-40 x 3/8” Hex Drive Black Oxide Finish Alloy Steel Flat Socket Cap Screw, part number 24541
Fastenal 6-40 x 3/8” screw fully seated as seen from the bottom
https://static1.squarespace.com/sta...ede59/1550891610520/_7202679.jpg?format=2500w
Sight fully mounted
12 yard test target
