I just picked up this Gew98. It's an R block, correct? The stock, handguard and floorplate and trigger guard match, while the bands and rear sight is mismatched. My main concern is the bolt. The number is right, but the suffix is wrong. The buttplate is marked with a number 5 which I've read indicates a Koblenz depot rework. Could the renumbered bolt be from them? Most I've seen have the bolt number crossed out and stamped over it, not ground off and marked on top.