Caliboose,
I think the stock you are referring to is the Knoxx CompStock:
![](http://www.blackhawk.com//CatalogImages/18-218-IMG3_T.jpeg)
It is supposed to have a built in recoil reduction system that reduces felt recoil by as much as 75%:
![](http://www.blackhawk.com//CatalogImages/18-218-IMG2_T.jpeg)
Since these are modified Hogue Stocks, if you decide to try one, I'd suggest you get the version that has the Full Length Aluminum Bedding Block, rather than the version that has just the pillar bedding. The full length version reduces or eliminates any flex in the forearm. The forearm on the version with just the pillar bedding flexes like a wet noodle.