Had one, got rid of it with a SMILE.
Automag II had one major problem...jamming. Their idea of a Benz Chamber is faulty at best.
Same with Ruger's 10/22 Magnum. It's been stopped & started in production 5 times.
it also had a really bad extractor issue. The old ones had a single extractor which would break, the new ones had double extractors, but when one would break, it would lock the bolt closed and you couldn't open it.
The only one I've found that works properly most of the time is the Grendel line of .22 Magnums: the P-30, P-31(pistols), R-31 (rifle/carbine)...looks like this! R-31
Grendel closed and is now known as Kel-Tec, but has yet to release a .22WMR-based weapon.
There is also the Volquartsen Fusion, which has FOUR barrels to switch in minutes between .17HMR/.22WMR & .17Mach2/.22lr at $1799.00 (argh). VQ also makes the Predator Pistol for $1684.00...little expensive for a .22WMR, IMHO. The VX-10 pistol I don't even want to quote a price for
I could buy a '68 Mustang GT for that.
There is a company that has started a new line of .22WMR Pistols & Carbines called ExcelArms...the MP-22 Accelerator, so far all reports are glowing.