Long Branch MK1 sight question.

Hello, this is my first post on this forum and I hope I can get some help with my question. So a few months ago I bought a MK1 micrometer sight off ebay that was in less then stellar condition (rusted and seized) so i removed the rust and got it moving only to find that someone had added some sort of aperture reduction piece to it which didn't allow it to move down to the 200 yard mark. What I'm wondering is, is this something long branch did or is this some aftermarket piece that someone hammered into the slide and I would be safe in drilling it out.

https://www.milsurps.com/images/impo...9dsc1075-1.jpg

https://www.milsurps.com/images/impo...3dsc1078-1.jpg

I might be missing what you are saying. What I do see in the first picture, the top one, is what appears to be welding metal or welding flash on top of the frame below the raised sight that appears to be blocking the sight from moving from below the 300 yd setting.

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What I do see in the first picture, the top one, is what appears to be welding metal or welding flash on top of the frame below the raised sight that appears to be blocking the sight from moving from below the 300 yd setting.

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It's not actually a piece of weld, the best way I can describe it is, its basically a little circular metal piece about 3/16" to 1/4" round with a hole drilled into it the same size as the hole in the front of the slide. It appears it was hammered into the slide.

I really don't see what you are describing. Is there some way you could point it out on one of the pictures?

This is what I was describing.

https://www.milsurps.com/images/impo.../09/this-1.jpg

Gotcha now.

First, My micrometer sight does not have anything where the circled bit is on your sight. That said, a link: http://ssporters.com/parts/enfield4.htm
Springfield Sporters listing No. 40B on that page should be what you want for $25. Alternately, SARCO Inc listing LE4019 is a No4 "REAR SIGHT LEAF WITH SLIDE". Then of course, you can try Brian at BDL Ltd.

The piece that I see looks like it is knurled. Is there any chance that it could be an aperture from a target sight that has been fitted into a threaded hole on the other side of the sight? Maybe it is screwed in, not hammered? What does the other side of the sight look like?

Being a big believer in the mnemonic K.I.S.S; I'd just get a new sight leaf and be done with it............ Then if you really do want a smaller aperture, just bush the rear ocular hole of the old leaf - but properly!

Your sight has two modications. The battle aperature has been openned up to a larger size. LB's have a very small hole. It appearas a correction was attempted by adding a fixed aperature to the slide's interior to reduce the aperatue openning which now limits the elevation travel. LB slide is a special as well. Brit parts aren't interchangeable. Your best bet is to replace the sight.

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The piece that I see looks like it is knurled. Is there any chance that it could be an aperture from a target sight that has been fitted into a threaded hole on the other side of the sight? Maybe it is screwed in, not hammered? What does the other side of the sight look like?

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I'm positive its not screwed in, its hammered hence the knurling, and the other side has the telltale signs of being hammered. The major sign is the leaf is slightly bent inward, secondly on the actual knurled piece shown had major marring on the back side as if someone tried to make it flush using a pin punch.

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Being a big believer in the mnemonic K.I.S.S; I'd just get a new sight leaf and be done with it............ Then if you really do want a smaller aperture, just bush the rear ocular hole of the old leaf - but properly!

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I am also a believer in K.I.S.S which is why I'll probably make good use of my drill press now and fix this failed modification.

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Your sight has two modications. The battle aperature has been openned up to a larger size. LB's have a very small hole. It appearas a correction was attempted by adding a fixed aperature to the slide's interior to reduce the aperatue openning which now limits the elevation travel. LB slide is a special as well. Brit parts aren't interchangeable. Your best bet is to replace the sight.

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I never would have known about the battle aperture, as for replacing the sight I probably won't any time soon, it works on the rifle although now that I think about it, it is kinda silly having a LB sight on a fazakerley rifle. Anyway thanks for the replies and confirming my suspicions now I can get to work on getting it back to near original condition

Who said that the sight parts aren't interchangeable RGG.............? I've worked on one or two and always found the parts interchangeable. The only 'problem' I have encountered is that very occasionally, the threaded SCREW, adjusting might be a tad tight or even too tight to screw onto the nut