I'm pretty sure I'm gonna go with the spectre II because ur like the 7th or 8th person that said it. Sweet as always thanks dude!The Checkmate is cool, but they also have a 3-lug like QD so if you want to use that on your hosts, you'd have the added cost.
I'd be looking at the Spectre II or the Dead Air Mask. But honestly this Innovative Arms Slingshot is what I'm looking hard at right now, and I want to see what the price is http://www.theoutdoorstrader.com/threads/innovative-arms-slingshot-22.1081531/
Btw I have a Thompson Machine integral you can shoot along with another 22 can.