Saw a "hyprid" style once..trying to find who makes them? Its like a Thumbhole but no Buttstock behind it..Meant for one hand pistol style but I guess the rear of the loop pushes against your forearm for a steadier hold? Thanks

Was originally a Fajen design nicknamed the push-pull. Looks like they are being made here now...
http://www.gunstocksinc.com/we...ontender-bigshot.htm

Harry Lawson also came up with a stock like that for Xp-100s. Not sure who was first.

I have yet to hold one, I think they are interesting though.

http://www.gunbroker.com/item/572964623

This contender also has one.