Adjustable Rear Sight

[Lacey Place]

I just bought a MKII - MK512 and the rear sight is missing the very small screw to the left of the elevation adjustment screw. What is the function of this screw and should I replace it? TIA, Lacey

 

[Cholo]

It keeps the sight from moving in its slot. Yes, replace it. I've had mine come loose and the sight did shift.

 

[kacher1]

This looks like the one you need--2 bucks but you need to order some other parts since a lot of them are just 2 bucks and shipping remains at 6 bucks (even for one item)

http://shopruger.com/searchprods.asp?searchstring=Mark+II+adjustable+sight+screw&pagenumber=6&val=0

 

[TomC321]

I have had my rear sights shift even with the set screws in place. I use Loctite, in addition to the set screws, to secure the sight in the dovetail.