External Adjustment Scope Blocks

Accurate info stated above. Be aware there's a minor stumbling block you may encounter, this happened to me with my Ersatz Sniper I built with a pre-war nickel steel receiver. I employed an old set of pristine color case hardened Unertl blocks, the O and E, and what happened was my bolt handle would kiss the ocular bell on my Unertl 8x (same scope as the Marine-specified one but without the "USMC" marking that would make it a stupidly expensive scope rather than an affordable civilian model). It was a not-uncommon occurrence with the rifles in service at that time, and the protocol was for the rifleman to nudge the scope out of the way with his thumb when operating the bolt. My solution was to try replacing the "R" marked (Remington) bolt with a correct pre-war nickel steel bolt - and the problem went away. There's a subtle bit of difference, evidently, between the dimensions of pre-war Springfield Armory bolt handle roots and the early WWII Remington bolts. The alternative solution would've been to order .10" higher blocks from Steve Earle, but the cheek weld was tenuous enough with the standard blocks and I didn't want to make it worse with higher ones.