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Old 07-14-2019, 08:18 AM
NMC_EXP

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Question 40X Factory Scope & Sight Block Heights



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I've been shooting a commercial 40X-B for several years. During that time for various reasons including being able to get a zero from 50 feet to 100 yards with two different scopes (Lyman STS and a Unertl) and with irons I've swapped out different mounting blocks for the iron sights and scope.

I used to be able to clean targets with iron sights but have not been able to do that for quite a while. Problem seems to be my eyeball line of sight is below the rear sight to front sight plane. I do not have an adjustable cheek rest.

I did not keep good notes and have lost track of the original block heights.

If anyone knows the factory sight and scope block heights I'd appreciate the info. I'd like to reconfigure to factory heights and see if I can get back to doing well with irons and having my scope 50 yard elevation zero closer to the center of the scale.

EDIT: Standard weight barrel.

Front iron sight block: ?

Front barrel mount scope block: ?

Rear barrel mount scope block: ?

Long rear receiver mount scope block: I do not use this one and did not change it

Rear iron sight base: .490 or .590 ?

Many thanks.

Jim

Last edited by NMC_EXP; 07-14-2019 at 10:33 AM.
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Old 07-14-2019, 09:36 AM
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edlmann
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This makes a difference:

What barrel weight?

This may help:


Last edited by edlmann; 07-14-2019 at 09:39 AM.
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Old 07-14-2019, 10:33 AM
NMC_EXP

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Edlman

It is a standard weight barrel. Critical detail - thanks.

And thanks for the chart. I'll save it.

Jim
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Old 07-15-2019, 01:49 PM
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As the above Redfield chart shows, front sight base is .325; front scope block is .290; the rear long scope block on the receiver bridge is .160. I know you can use a rear scope block on the front receiver ring, but I have never seen one on a factory configuration or even on a factory picture. With a .290 front scope block, one on the receiver ring would have to be shorter than the .160 on the bridge. Since there isn't a shorter one, this means the front scope block would have to be higher if you used a .160 on the front rec. ring. The rear iron sight base was a Redfield R-40X. This rear sight base is about .580 from center of mounting screws to center of sight attaching holes.
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