Walther q5 owners be aware - Vortex Viper 1x24mm Reflex Red Dot Sight

If you are looking to put this sight on a Walther Q5 pistol, you need to know this. The Doctor mounting plate that comes with the gun matches up fine with this sight. But the screws that come with the gun and the screws that come with the Viper sight will not work. They are either the wrong thread size, have the wrong type head, or they are too short to get a proper purchase with the plate. Contacting Walther, Vortex and Doctor didn't offer a solution, none could provide a workable screw replacement. Bottom line, I had to order a screw that would work from a different source. I wound up ordering M3-0.5x10mm flat head screws from monsterbolts.com. A pack of ten with shipping was less than $10.00. The 10mm length work fine but they are very close to being too long. I suggest you order 8mm or 9mm long screws. All this probably holds true with the Vortex Venom sight as well. I know the same problem exists when mounting the Burris Fastfire reflex sight to the Doctor plate because I've been that route too.
I haven't had a chance shoot this gun with this sight so I can't speak to the sight itself at this time.