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2. Franchi SPAS-12 - Wikipedia

   en.wikipedia.org/wiki/Franchi_SPAS-12

   A B-Square rail mount for optics was available for a short time in the 1990s as an aftermarket accessory. The barrel of the SPAS-12 was externally threaded to accept a variety of attachments. The barrel is cylinder bored and spreads a normal shot charge to about 900mm at 40 meters.

3. Stanchion - Wikipedia

   en.wikipedia.org/wiki/Stanchion

   Stanchions and velvet rope. A stanchion (/ ˈ s t æ n tʃ ən /) is a sturdy upright fixture that provides support for some other object. [1] It can be a permanent fixture. In nautical terms, the stanchion is the thick and high iron that with others equal or similar is placed vertically on the gunwale, stern and tops.

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. 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 ...

6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

7. Glossary of rail transport terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_rail_transport...

   Rail transport terms are a form of technical terminology applied to railways. Although many terms are uniform across different nations and companies, they are by no means universal, with differences often originating from parallel development of rail transport systems in different parts of the world, and in the national origins of the engineers and managers who built the inaugural rail ...