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Old 10-09-2017, 05:23 PM
VaTom VaTom is offline
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Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A  
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Default Scope Base Screw Size?-Marlin Golden 39A

Last week I posted a thread about the 1957-58 vintage Marlin Golden 39A that I purchased. It is drilled and tapped from factory for a scope base. I have the original base that came from the factory and the receiver has the screw plugs installed. I don't have the base mounting screws. Do any of you Marlin folks know what size screw is needed. I have checked the usual parts suppliers on line and their scope base screws indicate they are for a "late model" 39A which leads me to believe the screws for an older 39As are different - maybe smaller. The plugs have small threads. Any help would be greatly appreciated. Pictures are below.
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Old 10-09-2017, 05:55 PM
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bigggbbruce bigggbbruce is offline
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Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A  
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Measure what you have.
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Old 10-09-2017, 07:16 PM
Drm50 Drm50 is offline
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Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A  
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Originally Posted by VaTom View Post
Last week I posted a thread about the 1957-58 vintage Marlin Golden 39A that I purchased. It is drilled and tapped from factory for a scope base. I have the original base that came from the factory and the receiver has the screw plugs installed. I don't have the base mounting screws. Do any of you Marlin folks know what size screw is needed. I have checked the usual parts suppliers on line and their scope base screws indicate they are for a "late model" 39A which leads me to believe the screws for an older 39As are different - maybe smaller. The plugs have small threads. Any help would be greatly appreciated. Pictures are below.
6x48-length I can't tell you because I'm not familar with mount.
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Old 10-09-2017, 07:54 PM
VaTom VaTom is offline
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Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A Scope Base Screw Size?-Marlin Golden 39A  
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6x48-length I can't tell you because I'm not familar with mount.
Thanks - VaTom
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Old 10-09-2017, 11:35 PM
2152hq 2152hq is offline
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I think you'll find the Marlins are 8-40 thread.

The 'Late Model' 39A scope base is the double rail type. That has 2 sets of rails on the same base. One for the smaller dia scopes using the tip-off style mounts like most .22 scopes. On the same mount, they just milled another set of rails to take Weaver style rings so 1"d scopes can also be used with the same mounting base.
The 'Early Style' is the one like you have ,,same idea just a bit narrower as it is machined to take just the .22 tip-off style scope mounts. We used to call these the cantelever mount.

I can't remember when they went to the later style,,probably mid to late 70's is my guess.


The screws for the early style I believe are 8-40 thread,,1/4" thread length.
Weaver Style oval head mounting screws. (Two types,,high and low oval head. Low for the 39 and the very slightly higher dome style for the 336, 444, ect. But the latter will work just fine in the 39 mount. Most wouldn't even notice the difference.

I think I have one of the bases and a few of the screws yet from my time there in the early 70's. They threw anything out that fell on the assembly room floor. It was a gold mine for parts.

Check your rifle to make sure of the thread size.. and if it's 8-40,,I'll send you some of the screws.



FWIW,,,MArlin usually shipped the scope and mount (or a sling if included in a package deal) unattached to the rifle. That avoided them having to pay Fed Excise Tax on the final value of the rifle+scope+mount.
Instead they paid FET on the rifle only
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Old 10-09-2017, 11:38 PM
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DWalt DWalt is offline
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They will be either 6-48 or 8-40. I have not seen a sight or mount screw which was not one or the other.
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