Ordering Restrictions: No sales to CA or where otherwise prohibited. Note: Multiple WALTHER THREAD ADAPTERS are shown for reference. Price is per each package of one adapter with thread protector. Firearms are for product display and are not included with adapters.

From the Tactical Innovations Website:

If you want to get the full fun value out of your Walther P22 handgun by being able to mount any 1/2x28 TPI threaded accessories such as a suppressor, a flash hider from an AR15 or one of our unrestricted fake suppressors, then this is the part that you need. This thread adapter easily replaces the factory barrel nut using Walther's factory supplied barrel wrench and works equally well on 3.4" and 5" guns. (However, it will not work on CA non-threaded guns.)

We manufacture literally 1000's of Walther Thread adapters for other firearm manufacturers, national firearm wholesalers, local retail gun shops and you, our internet customers. So, don't let our low price fool you about the quality. Our professional volume manufacturing capability allows us to offer you a precision machined adapter at a price that you won't beat anywhere. Our Walther P22 Thread Adapters are CNC manufactured to precision tolerances from solid steel rod (NOT aluminum) in one CNC lathe operation to ensure exact thread alignment and are hot salt blued to match your P22 pistol. Each retail packaged adapter assembly consists of one adapter and one knurled OD thread protector. If you don't yet have a thread adapter for your P22, you're missing the best part of the gun! Order one now!