I am new to F Class and am looking to purchase a rear bag. I know there are several good models out there. My question is more specific to the stock I am using. I will be using a Choate Tactical stock. It's what I have at present. My question is this. This stock has a wider base at the butt of the stock. It is also made of Rynite and has small stipples for lack of a better term. What bag would be conducive to a wider base to slide properly? I would prefer a squeeze bag type for elevation adjustment. I also believe cordura may be better for the stock to slide properly than leather. Any input to a specific bag would be appreciated. Thanks.