I have this one in 270 great little gun.This one is from the first production run as there were eventual changes to the bolt release and safety etc on the later models.Also if you don t know already ,you can switch calibers(of the same bolt head size) by just switching barrels something a kin to the blaser rifles.The 66 was set up as a switch barrel gun and changing barrels is a breeze.You may have to look around for a while to find an accessory barrel but they are out there.If you can import a barrel from Germany it would probably be your best bet.Try E gun an online gun site from Germany.