External Adjustment Scope Blocks

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  • Last Post 22 March 2023
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Bud Hyett posted this 19 March 2023

Does anyone have the number or height of the blocks for the 1903 USMC mounts? I want to mount an Unertl scope on a 1903 receiver and barrel.

Farm boy from Illinois, living in the magical Pacific Northwest

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Bud Hyett posted this 22 March 2023

Thanks everyone for your input.

I've ordered the 1903 set of blocks from Steve Earle. 

Farm boy from Illinois, living in the magical Pacific Northwest

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RicinYakima posted this 20 March 2023

Accurate observation! To the best of my knowledge, USMC never used WW2 replacement bolts, but their supply of double heat treated and nickel steel bolts they bought to rebuild all their 1903's in the 1930's. 

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gnoahhh posted this 19 March 2023

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.

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Bud Hyett posted this 19 March 2023

Steve Earle has a set specifically for the 1903 Springfield. I'll call in the morning and order. 

Thanks everyone for your input. 

Farm boy from Illinois, living in the magical Pacific Northwest

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RicinYakima posted this 19 March 2023

 They are E and O from Unertl, but unmarked from SA (most likely Lyman made).

Steve Earle blocks are excellent, btw. Just make sure you get the correct mounting cuts. 

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Oldman 1950 posted this 19 March 2023

check this out

scope blocks (steveearleproducts.com)

Any day you wake-up sucking air will be a good day

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