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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
First of all, there must be a flat surface sufficiently to the rear on the left side of the receiver for ample screw attachment of the sight base. There also must be adequate receiver wall thickness to accommodate the attaching screws.
It is adjustable for wind-age using a dial on the side of the sight base. Showing the AK47 influence, the front sight is adjustable for elevation.
A blank filler plate over the optic platform cut has caused the rear sight base to be set back and shortened.
Iron sights were left off, although the muzzle was milled for the standard front sight base. One-piece Redfield optic bases attached to the rear peep sight mount and were screwed to the front receiver ring.
Simply tap the side of the dovetailed sight base with a brass punch and hammer.
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.
The front sight base is specially made to suit the low rib and rear sight as Recknagel ring type bases are too high.
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.
There is a central screw in the rear sight that adjusts for elevation against a spring beneath the rear sight base. A diopter rear sight was offered by Beretta and mounted to the rear tang.
This spectacular rifle in .375 H&H Magnum is in unfired condition and wears its original 25-inch tapered heavy sporter factory barrel with hooded ramp front sight and island rear sight base topped with two folding leafs.
Remove a screw in the rear sight base, push the night sight down into place, reinstall the screw and it's done.