True- but the Katana stocks fit the same- you could just fill using auto body filler... It might be a little heavy though. I'm re-filling some of the inlet w/ 7/8" wooden dowel, and re-inletting the stock (at home, w/a router) , and filling the rest in with auto body filler. I'm also kicking around the idea of pillar and glass bedding it as well. That's another route the OP can take... For what, $60 and some elbow grease, the OP can have a pretty decent stock!