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Due to this design, the bolt handle lifts only 60 degrees on opening giving more clearance for scopes compared to the 90 degrees required for the Model 700 and other two-lug rifles. The bolt travel is also reduced because of the rear lugs. The bolt pictured is a pre-1975 locking model from a .308 Winchester caliber rifle.
The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. [6]
Bushnell scopes on display at a hunting exhibition. Also known as Bushnell Outdoor Products, Bushnell specializes in optics. Its products include binoculars, spotting scopes, telescopes, night vision equipment, GPS devices, laser rangefinders, riflescopes, holographic weapon sights, game cameras, and other high-end optical equipment.
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.
Some service rifles used by Soviet and Warsaw Pact nations armed forces have a distinct type of side-mounted scope, informally known as a Warsaw Pact rail. [7] The mount is found on the left side of the rifle receiver, with machined cutouts for reduced weight and ease of installation; an example is the PSO-1 optical sight.
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The locking bar system allows for even stress to be distributed and prevent canting of the scope mount. Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place.