Arrgh! just got my scope base, the nut for the .303 is not part of my order, they sent me the nut for the .308 Ishapore! Had to email them to try and get that sent out! Otherwise its' a nicely made piece of kit. It's not totally 'no gunsmithing' you need to inlet the foreend for the forward clamp, and I see I'm going to have to file a bit on the recoil shoulder to make the bolt go in and out of the gun; it's like that Advanced technology 98 mauser standard eye relief scope base in a very generalized way.