If you are just wanting something for the A2 stock you have now, then check out the Sorbothane buttplate offered by Kick-Eez which is a bolt-on replacement for the standard plastic trapdoor buttplate. Same for the rubber buttplates offered by John Masen. All will add at least SOME length to the stock, so be advised when ordering that it might mess with the fitment of the rifle for you. You can also try the medium-size Limbsaver slip-on pad (I think its the medium, but double-check the size on their website). I'm not wild on slip-on type pads as I have found them to suffer from generally poor fitment in the past, but I have a friend who is VERY recoil sensitive because of an injury and he runs the Limbsaver slip-on and it actually works VERY well on his A2.
