Buffington sight with loose slide

I recently picked up a very nice 1873 Springfield. It has the buffington rear sight, and when I tighten the locking screw down the slide still moves freely.

Has anyone else had this issue? I dont know if adding a few threads to the screw so it gets pulled in tighter would be the fix or if i need a new screw or a whole new sight?

Either way, I am not going to attempt the repair myself, and will bring it to a gunsmith, unless it is something simple like changing out the screw.

beag_nut said:

By "locking screw" do you mean that little screw on the elevation portion (slide?) of the sight?

Click to expand...

Yes, that is the part

beag_nut said:

Well, here is a website which I hope has the screw you are looking for. Google can be helpful, and I hope this does:

https://regtqm.com/product-category/original-items-parts/

I see the screw about 20(?) items down the page .

Click to expand...

Thank you. I ordered that screw to try. Is this a common problem on these guns?