I've dealt with a couple Superbolts but I've never heard of the particular problem you're describing. As R3L said, this immediately sounds like something that can be cured by adjusting the hammer lug.
Originally Posted by EvilAuthorityX
Take out the washers and use only the front trigger frame screw. If the gun cocks then the rear screw is too long preventing the hammer from cocking back
Or at least try removing the velocity adjuster and cocking rod and looking down the rear of the lower tube and see if any of the grip frame screw is protruding into the gun.
Also, is there anything wrong with the frame? Everything inside assembled correctly and no internals sticking up past the upper edge that could catch and bind?