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Unertl 8x scopes
- Thread starter 4V50 Gary
- Start date
reynolds357
New member
I dont know. I have seen a couple of them. However they were sealed all those many years ago, they obviously were no longer sealed.As used by the USMC in WW II, how well were they sealed? I don't think nitrogen filling was a thing at the time.
Unertl external adjust scopes
the vast majority of Unertl external adjust scopes such as the WW2 USMC 8X were not sealed or nitrogen filled. Unertl internal adjust scopes are a different story. I own an early Unertl 11/2" 10X external adjust target scope, s n 172. It is not sealed....
the vast majority of Unertl external adjust scopes such as the WW2 USMC 8X were not sealed or nitrogen filled. Unertl internal adjust scopes are a different story. I own an early Unertl 11/2" 10X external adjust target scope, s n 172. It is not sealed....
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Far as I know, none of those older Fecker, Litchert, Lyman, deSimone and Unertl externally adjusted scopes were gas filled.
Properly mounted, they're the only scopes that all of them can guarantee exactly 1/4 inch, mil, or MOA @ 100 yards per click. No internally adjusted scope can do that.
Properly mounted, they're the only scopes that all of them can guarantee exactly 1/4 inch, mil, or MOA @ 100 yards per click. No internally adjusted scope can do that.
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Only problem with these scopes is the barrel vibration frequencies are different without the front mount on the barrel when metallic sights are used in long range matches. Bullets won't leave at the best angle on the bore axis upswing to compensate for velocity spread.
All of which is why internally adjusted scopes by Weaver and Unertl began replacing them in the 1980's for use in highpower long range matches.
All of which is why internally adjusted scopes by Weaver and Unertl began replacing them in the 1980's for use in highpower long range matches.
Fun fact, when bases are mounted at the correct 7.2" center to center spacing the amount the click moves the scope for 1/4" at 100 yards is .0005".
Both those externally adjusted scopes and target rear aperture rear sights have 40 tpi leade screws. Rear scope mount knobs had 50 clicks per turn, target rear sight knobs used 12 clicks based on the standard sight radius of 30 inches.
When I had a 1.5" Unertl 20X scope, I mounted the rear base on the receiver bridge 10.8" back from the front base. That gave 1/6th MOA change per click. Most important was the LOS adjustments were much easier to reach and prone position stayed more repeatable between adjustments.
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Jim Watson
New member
Unertl made "bridge bases" that kept the target scope off the barrel.
Remington made their own external adjustment target scope that put both bases on the receiver of a 40X.
Remington made their own external adjustment target scope that put both bases on the receiver of a 40X.
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Found these on the Malcom which is a copy of the Unertl. User manual and Recoil Spring Assembly instructions:
https://cdn.shopify.com/s/files/1/1742/8201/files/8X_Malcolm_Owners_Manual.pdf?7748966545434398741
https://cdn.shopify.com/s/files/1/1742/8201/files/Recoil_Spring_Assembly_Installation_Instruction.pdf?7748966545434398741
https://cdn.shopify.com/s/files/1/1742/8201/files/8X_Malcolm_Owners_Manual.pdf?7748966545434398741
https://cdn.shopify.com/s/files/1/1742/8201/files/Recoil_Spring_Assembly_Installation_Instruction.pdf?7748966545434398741
For the visually or audio oriented, the dismounting of the spring is covered here:
https://youtu.be/z4hWW5ssoWQ
https://youtu.be/z4hWW5ssoWQ
.Parsons scope service used to do a wonderful job on Unertls. I dont know if they are still in business
Parsons is still in business:
http://parsonsscopeservice.com/services.html