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2. Dovetail rail - Wikipedia

   en.wikipedia.org/wiki/Dovetail_rail

   The SIG Sauer 200 STR has an 11 mm dovetail on the receiver for mounting a diopter rear sight or a scope sight, either directly or via a Picatinny rail adapter.. Dovetails come in several different types and sizes depending on manufacturer, but the most common are the 11 mm and 3 ⁄ 8 inch (9.5 mm).

3. Picatinny rail - Wikipedia

   en.wikipedia.org/wiki/Picatinny_rail

   The only significant difference between the MIL-STD-1913 rail and the similar Weaver rail mount are the size and shapes of the slots. Whereas the earlier Weaver rail is modified from a low, wide dovetail rail and has rounded slots, the 1913 rail has a more pronounced angular section and square-bottomed slots. This means that an accessory ...

4. Rail integration system - Wikipedia

   en.wikipedia.org/wiki/Rail_integration_system

   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 ...

5. NATO Accessory Rail - Wikipedia

   en.wikipedia.org/wiki/NATO_Accessory_Rail

   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.

6. Weaver rail mount - Wikipedia

   en.wikipedia.org/wiki/Weaver_rail_mount

   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]

7. Heckler & Koch USP - Wikipedia

   en.wikipedia.org/wiki/Heckler_&_Koch_USP

   The USP has an accessory rail at the front of the frame for attachments of aftermarket equipment such as laser sights and weapon lights. The rail is a proprietary design, and the number of accessories available is extremely limited. Aftermarket adapters providing a standard Picatinny rail are available for both USP and USP Compact models.