Fine Guns | Accessories | Gunsmithing
NECG Classic Rear Sight Base R-201B. This rear sight base is the same one we use for our R-201 Classic Adjustable Rear sight. The benefit of this base is that it allows you to use any rear sight insert with a 16mm dovetail. This includes our "See-Thru" rear sight, the "Moon" sight insert, R-208M Mini Express as well as many other 16mm sight inserts found on our website. The sight inserts are held in place by a dovetail clamp which is secured with a 6-48 Allen head screw. Loosening this screw and clamp will allow for windage adjustment. All steel construction with a black oxide finish. Uses a single 6-48 barrel attaching, base screw (Included).
Dovetail height over barrel is .200". Simply add the insert height to determine the overall rear sight height.
Due to increased product costs, we will only be offering this sight base with a 9,0mm / .354" radius to fit diameters .708" and larger. While supplies last, we are still offering a larger 10,5mm /.413" radius to fit diameters .826" and larger. The bottom radius will need to be machined for the larger barrel contours.
Fitting an NECG R-201 Classic Rear Sight base to a RUGER rifle barrel.
If you remove the RUGER factory rear sight base and find 8-36 screw holes, you will need to alter the attaching base screw hole and 8-36 Flat Head screw to fit the new sight base.
Follow these steps:
1) Disassemble the NECG R-201 Classic Rear Sight by loosening the clamp screw and tapping out the sight insert.
2) Confirm base radius / barrel fit and modify the bottom base radius as needed for best results.
3) Set the base up, level, in a milling machine or drill press vise.
4) Using a 6-48 WEAVER counterbore, deepen the 6-48 hole by .050"
5) Switch to a #20 drill bit and drill out the 6-48 clearance hole for the new #8 screw.
6) Chuck up a 8-36 Flat Head screw in a lathe or drill press. Turn the screw head to .213" diameter.
7) Check the screw head fit in the altered base hole.
8) Shorten the screw thread until the base is securely tightened onto the barrel.
9) Check the level of the rear sight base against the scope base and front sight ramp.
10) Proceed with final sight finishing and/or sight assembly.
