The sooner I get help the sooner I can release a CoD version of a Dragunov (with CoD sounds straight from the game, and a scope to match the black ops version to boot!)

So here is my issue.....all the character look like they are holding the gun much further up the rifle then they should (by the magazine) and I have no idea how to remedy this... do I need to make the stock longer? or do I have to do something different entirely?