[Lost Californian]

I have a 938 Nightmare with the .22lr conversion and a threaded barrel. SIG does not offer a M9 x .75 to 1/2 x 28 adapter, or so I was told when I called them. Does anybody have a reccommendation for an adapter? There are several different adapters out there - Gemtech and Advanced Armament make them for the Mosquito, same thread pitch. Top Gun Supply has one for ~$7. Just wanted to know if there is any first hand experience with one.

Thanks.