The sight leaf is drilled on a special drilling machine that drills both sides at the same time. The machine was NOT set up properly when your leaf was drilled, and the operator is NOT using the Pin Gages to check his work!

The correct setup and operation of that machine and those gages were MY responsibility, along with training the operator in North Haven..........The machine is a "Bear" to set up, but the gages always prove the setup.

Call and complain!............they should send you a complete new rear sight, or at least a properly drilled sight leaf.

Ask that they RE-Check the parts they are going to send you, too. I'm sure there are a large number of sights just like yours, now.


Tom

 

Welcome to MO.

Among the many quality issues Remington-made Marlins display, rear sights seem to be one of the most common problems.

 

Tomray, could the dovetail in the barrel be milled out of spec? AC

 

Tomray, could the dovetail in the barrel be milled out of spec? AC

AC,
There's always that chance too, althought the sight spring looks to be straightly aligned with the CL of the barrel.

I understood? from reading the OP text that the leaf is lower on the right side........The leaf itself is a MIM part, so repeatability in geometry is never an issue. In viewing the pics, it looks to me that the fulcrum point on the hinge is off, from one side of the leaf to the other......

Tom

 

@Tomray, thank you for the information. Would I have to send the rifle back to replace the iron sights or is this something I could do at home? Do you or anybody else have any suggestions as to which guides or what search terms I should use to find videos or a step by step picture guide on how to swap out the rear iron sights?

 

No, you needn't send the whole rifle back. They should send you new replacement parts. If they want the whole rifle, ask for a shipping tag, so you can ship on their dime.

Changing out the rear sight is easy.
Remove the Elevator, and slide a piece of heavy paper under the sight assembly to guard against scratching the barrel. Then, with a wood dowel or Brass/Plastic drift and a hammer, tap the dovetail part of the the sight out TO the right side. To re-install, tap the new sight in FROM the right.

Can you post a pic of the rear sight as seen from the top, so I can see how the sight lays on the barrel. and also, you should look at each side hole on the leaf to see if they appear to be located correctly on the part.

Tom

 

warning: picture heavy

I took some more pictures. I probably should of taken and included these beforehand. Hopefully this can display a better idea of what I'm dealing with. Would this be fixable if Marlin decides to mail over some new iron sights?

Edit: I saw your reply while editing and tried my best to take a centerd top view by hand as I don't have a tripod. I also included 2 pictures each of the holes on both sides. My apologies for this thread becoming picture heavy. I could try grouping and hyperlinking the images as URL's to prevent a slow load of all these hi-res images. Currently trying to figure out how to delete the incompleted attachments on this reply. The pictures include view from shoulder, top, and knotches on both ends of the sight. I should add, that I am able to align the rear sight to the front one just fine when I shoulder it as if I'm going to take a shot, just that it's a bit slanted up from the right side. I could take more pictures if requested.

marlin 336 - Imgur

 

336w001,

This is a little hard to do via text and internet pics, but In viewing the latest pics, I think its the sight spring (base) that is causing that "hi right" condition. The L&R holes on the sight leaf look OK to me, and the base seems to lay correctly on the barrel, so the barrel dovetail is correctly cut.

Try this:

Remove the sight elevator.

Squeeze the legs of the sight base (spring) together,with pliers just in front of the leaf, and disassemble the leaf from the base.

Inspect the legs of the base where they are bent, just in front on the leaf to see if the right side looks to have more bend than the left side......

Does the right side sit a bit higher than the left? If you find this to be true, then carefully bend the right side down a bit so it matches the left. Or, bend the left side up to match the right side.

All this may be easier to do, if you remove the whole rear sight off the barrel.

I Hope this helps you, this is hard to for me to diagnose via the 'net, and I sure don't want to lead you in the wrong direction.


Tom

 

It Looks to me like the holes on the buckhorn are definitely drilled crooked. On the left side, the top of the hole is all the way up where the curve starts. On the right side, the hole is lower, and there is still some 'flat' portion between the top of the hole and the curve.

 

Thank you Tomray. I took your advice and attempted to equalize both sides. Not sure if it made a difference as it was kind of hard to tell the pins were uneven once I took the sight apart. I installed back the spring first, and it looked even on both sides of the leaf. Then I installed the sight elevator back and it seems to have evened out a bit. At least better than how it was before. My theory is, the iron sight took a bump from the elevator side and therefore was at a minute awkward angle, not centered, on the barrel causing one side to be taller than the other. Not sure if that makes sense. Once I installed everything back and lined it up, the imbalance was gone to some degree. I uploaded a side-by-side before and after comparison picture to the gallery. Thank you once once again Tomray and to everyone else's suggestions. You helped me confirm this was not factory setup, and a home remedy to repair it to a usable state. I will still try and get a hold of Marlin to see if they are willing to send me a new factory iron sight as my confidence is still not there with this current one. I will leave the album up so people can use it as a future reference in case anyone stumbles upon this thread via the forum's search function or other search engines. Thank you all.

marlin 336 - Imgur