Whats the deal with these?  Any good?  I stumbled upon one and it looks really cool and fun to shoot.  Any one every tried one?

http://www.thewarbirds.com/Main%20Page/warbirds%20bxpx/weapons%20cage/Rifles/semi-autos/m1600.htm

I have two, an '81 A1 style and a newer post-ban. The gun is basically an Armscor Model-20, with M-16 (or the AK-47) attachments. LOTS of fun as a plinker, but will never be a target gun. The action is over-complicated, with a lot of springs and ballbearings, and I've had very little luck trying to reduce the trigger pull.

Check out Rockin' Rimfires

The Armi-Jager AP-74/Mitchell AP-15 is a nicer rig (I have one of them too), and there is a real nice one on Auction Arms, right now.