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The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
Among scopes for rail mounts, the 22.5-degree V-shaped Zeiss rail is the most prevalent standard. It was introduced in 1990. After the patent expired in 2008, compatible scopes have been offered from manufacturers such as Blaser, [1] Leica, Minox, Meopta, Nikon, [2] Noblex (formerly Docter [3]), Schmidt & Bender [4] and Steiner. [5]
A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail [1]) is a generic term for any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...
It was originally used for mounting of telescopic sights atop the receivers of larger caliber rifles. Once established as United States Military Standard , its use expanded to also attaching other accessories, such as: iron sights , tactical lights , laser sights , night-vision devices , reflex sights , holographic sights , foregrips , bipods ...
The sight reticles for both the M16 rifle and M14 rifle required firing a minimum of 20 rounds to seat before the zeroing procedures could begin, leading to an excessive expenditure of ammunition. The sight reticles were subsequently modified, requiring only 2 rounds for seating purposes.
Reticle of Bell & Howell Pocket Comparator Reticle accessory (PD-8) used in sniper rifles A reticle , or reticule [ 1 ] [ 2 ] also known as a graticule , is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight , spotting scope , theodolite , optical microscope or the screen of an ...
F14 Compass, lensatic, M1918 – Parts and equipment, 16 September 1927; F15 Machine gun clinometer M1917 Parts and equipment; F16 Sight, panoramic, machine gun, M1918 – Parts and equipment; F17 Device, aiming, mirror, M1918 – Parts and equipment, 23 November 1926; F18 Night lighting device, parts and equipment; F19 Board, deflection, M1; F20
The scope body is sealed and filled with nitrogen, which prevents fogging of optics and was designed to function within a -50 °C to 50 °C temperature range. For zeroing the telescopic sight the reticle can be adjusted by manipulating the elevation and windage turrets in 5 centimetres (2.0 in) at 100 metres (109 yd) (0.5 mil or 1.72 MOA ...