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For example on an AR-type rifle, the mil-spec distance from center of bore to top of rail is 1.211 inches, or approximately 31 mm (1.2 in). The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available).
The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
All of these cases were based on the .404 Jeffery with the rim reduced from .543 inches to fit the .532 inch bolt face for existing magnum rifles. [8] [7] The only known shotgun shells using rebated rims is the Roper repeating shotgun [9] and the 12 Gauge RAS12, specially made for the RAS-12 semi-automatic shotgun. [10]
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.
Steyr AUG's telescopic sight. Note the backup iron sights on top of the scope. The AUG has a 1.5× telescopic sight that is integrated with the receiver casting and is made by Swarovski Optik. It contains a simple black ring reticle. The sight cannot be set to a specific range but can be adjusted for windage and elevation for an initial zero ...
The CAR-15 name was an attempt to re-associate the AR-15 name with Colt, since the AR initially stood for "Armalite Rifle" the original manufacturer of the Armalite AR-15. Colt later abandoned the CAR-15 concept, but continued to make carbine variations, using the "M16" brand for select-fire models and the "Colt AR-15" brand for semi-automatic ...
When red dot sights started to appear at the practical shooting competition circuit in the 1990s, reticle sizes of up to 3, 4.5 or even 6 mrad (10, 15 or 20 MOA) were common in order to compensate for the lack of bright illumination. However, as red dot technology and production quality has advanced, the market trend in all types of sport ...
Like the any-position pistol shooters, standing pistol shooters adopt odd positions in their quest for the most stable possible shooting position. Standing pistol is the most difficult discipline; no one has yet shot a perfect 40x40. Standing big-bore any-sight pistol matches are often tied with perfect scores, and decided by a tiebreaker. [3]