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The 10/22 was offered in mag for awhile. I think the .22 mag is considered a reach out rimfire round and not one whose application would require rapid shots. Since bolt action rifles are typically more accurate and .22 mag users want that, most .22 mags are bolt rifles. In other words, there is no market for .22 mag semis or someone would be making them.
I had an AMT Automag II .22WMR semi-auto pistol. Looked really cool but I never liked it due to the poor reliability. Regardless of wither it is a rifle or pistol, the brass of the cartridge casing is too soft and thin to work reliably in that kind of gun due to cartridge length. Excel Arms allegedly is the only one that works well, but I chalk it up to hearsay until I get to actually shoot one. If you want a semi-auto magnum, get centerfire. The brass is tough enough to handle it.
The Marlin 22 magnum was the model 922. It was intended to
be like the camp 9 and camp 45 semi-auto rifles.
It is heavy; but seems to be reliable and fairly accurate.
The reason is a bit more complicated than lack of market. The .22 Magnum is a high pressure round. Makers want to keep .22 auto rifles simple, which means blowback actions.
Now the breechblock (bolt) mass needed to keep the lid on the .22 LR until the pressure drops is not great. But the mass required for the .22 Magnum is greater, too great for a simple lightweight rifle. So makers play some tricks. Ruger used a bolt material that had greater mass than steel, and bulked up the bolt. AMT used holes drilled in the chamber to slow down the cartridge case, but still had problems.
Most makers just sort of gave up on the idea in part because the cost of ammunition meant there was not a lot of demand for rifles that would shoot a lot of it quickly.
I HAD a Marlin 922M, I think it was called, but sold it like an idgit. In my defense, it didn't appear terribly accurate with the ammo I tried (like 2.5" group at 25 yards), so at the time, I didn't think I wanted to keep it.
The Magnum Reasearch model has a gas port and a special gas block under the barrel just ahead of the receiver to help equalize the pressures to allow smoother operation while firing. It supposedly cures some of the reliabilty issues Ruger was having with the 10/22 mag. I remember seeing a picture of it one the website of a gun magazine but I cant remember where. Hopefully someone else knows what Im talking about.
I have a ruger 10/22 Mag and love it. I put a green mtn barrell on it and a hogue stock. It shoots 3/4 inch groups at 50 yards all day.
If you can find one buy it. The prices have really gone up.
I've got a 597 22wmr with heavy barrel, it's very reliable and accurate. My son and I practice with a steel prairie dog spinner and can hit it consistently out at 200 yds.
I use it for predator hunting and it does just fine.
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