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2. 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]

3. History of crossbows - Wikipedia

   en.wikipedia.org/wiki/History_of_crossbows

   The state of Chu favourited elite armoured crossbow units known for their endurance, and were capable of marching 160 km (99 mi) 'without resting.' [21] Wei's elite forces were capable of marching over 40 km (25 mi) in one day while wearing heavy armour, a large crossbow with 50 bolts, a ji strapped to their back, buckle helmets to their heads ...

4. Crossbow bolt - Wikipedia

   en.wikipedia.org/wiki/Crossbow_bolt

   An unusually small crossbow bolt with a tapered "waist" shaft section and rear skirt compared to a 1 euro cent coin A bolt or quarrel is a dart -like projectile used by crossbows . [ 1 ] The word quarrel is from the Old French quarrel (> French carreau ) "square thing", [ 2 ] specialized use as quarrel d'arcbaleste (> carreau d'arbalète ...

5. Crossbow - Wikipedia

   en.wikipedia.org/wiki/Crossbow

   21st-century hunting compound crossbow. A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a prod, mounted horizontally on a main frame called a tiller, which is hand-held in a similar fashion to the stock of a long gun. Crossbows shoot arrow-like projectiles called bolts or quarrels.

6. 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 ...

7. List of United States rapid transit systems - Wikipedia

   en.wikipedia.org/wiki/List_of_United_States...

   The following is a list of all heavy rail rapid transit systems in the United States. It does not include statistics for bus or light rail systems; see: List of United States light rail systems by ridership for light rail systems. All ridership figures represent unlinked passenger trips, so line transfers on multi-line systems register as ...