sight base

sight base

[′sīt ‚bās]
(ordnance)
In gunnery, the distance between the eye and the rings of an optical ring sight.
Mount for a gunsight.
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References in periodicals archive ?
The post is offset and can be adjusted for windage zero by loosening the retaining screw in front of the sight base and inserting a small tool through a hole in top of the protective hood.
This used-but-not-abused boxlock has 24-inch Chopper lump barrels with a matted quarter rib and stippled front sight base, express rear sights and a finely marbled European-walnut buttstock.
Tenders are invited for Ote: Rear Sight Base F1303- 028081 D In Finished Condition Dc No.
Regular readers may recall a column on the Amega Mini-Scout sight base for the Mini-14 in the September 2010 issue.
Check to see if the line on the elevation cam assembly matches up with the lines on the rear sight base at each of the detents.
All I had to do was drive the front sight band onto the barrel, pin it in place, and install the sight base and blade.
Windage adjustments in those simpler models were made by drifting the front sight or shimming the tang sight base.
The rifle itself is your basic Stoner-style carbine, with a 16-inch barrel complete with M4/203 barrel cut and a fixed front sight base.
The front sight base has a serrated front to reduce glare.
I could cut a dovetail in the sight base and put in a Marble's front sight blade or cut a groove parallel with the bore, insert a blade sight, and pin it in place.
Place the receiver on the end of the barrel shank with the rear sight base aligned with the sides of the trunnion.