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The MIL-STD-1913 rail is commonly called the "Picatinny Rail", in reference to the Picatinny Arsenal in New Jersey. Picatinny Arsenal works as a contracting office for small arms design (they contracted engineers to work on the M4 [4]).
Right: Acro rail on a Picatinny riser. Approximate Acro rail measurements. Many reflex sights (e.g. red dot sights) and holographic sights have proprietary mounts. [23] Aimpoint Acro rail: A dovetail rail for attaching a sight via a clamping mechanism, and with a 4 mm [24] wide straight recoil lug groove. The dovetail is approximately 16.5 mm ...
The C7 has been developed to the C7A1, with a Weaver rail on the upper receiver for a C79 3.4×28 optical sight, and to the C7A2, with different furniture and internal improvements. The Diemaco produced Weaver rail on the original C7A1 variants does not meet the M1913 "Picatinny" standard, leading to some problems with mounting commercial sights.
The Picatinny rail has a similar profile to the Weaver, but the recoil groove width of the Picatinny rail is 0.206 in (5.23 mm) versus 0.180 in (4.57 mm) of the Weaver rail/mount, and by contrast with the Weaver, the spacing of the Picatinny recoil groove centers is consistent, at 0.394 in (10.01 mm). [5]
The proprietary rail systems use matching slide-in mount fasteners to connect the telescopic sight to the gun. Some proprietary rails also offer the possibility to tilt the sight up to 1° (60 moa; 17.5 mrad) to the left or right. Technical advantages of rail mounting systems are the reliability and robustness of such mounting solutions.
The 10/22 Competition rifle has a hard-coat anodized, CNC-machined receiver made from heat-treated and stress relieved 6061-T6511 aluminum. The receiver incorporates a rear cleaning port and an integral, optics-ready 30 MOA Picatinny rail.
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 ...
NATO Accessory Rail (STANAG 4694) The NATO Accessory Rail (NAR), defined by NATO Standardization Agreement (STANAG) 4694, is a rail interface system standard for mounting accessory equipment such as telescopic sights, tactical lights, laser aiming modules, night vision devices, reflex sights, foregrips, bipods and bayonets to small arms such as rifles and pistols.