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Ordered one off of GB for $425. What am I in for? Accurate? Ammo picky?
I know they're made by Hammerli.
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Probably the most accurate .22 you can get for that price. They didn't leave the factory if they couldn't group five shots within 1" at 25m and came with a target to prove it. Mine measures 0.625".
They are designed to use standard velocity and I haven't had any issues with whatever I run through mine but I tend to use decent ammo.
They have a very good adjustable trigger that can be made even better with some $$.
Magazines are $35 each and new ones are usually only available from Larry's Guns. Larry's also carries other factory and aftermarket parts for them. If you order anything from Larry's, get a bag of chamber plugs so you can safely dry fire the pistol.
Search online and read about the trigger guard issue. Some guns need a bit of material removed for the trigger guard to fully seat, otherwise the trigger guard can break.
The slide stop detent on the aluminum slide is known to wear to the point that they will no longer hold the slide back on an empty magazine. Manually racking the slide instead of using the slide stop will minimize wear to the slide stop detent.