Search results
Results from the WOW.Com Content Network
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Unertl Optical Company, Inc. was a manufacturer of telescopic sights in the United States from 1928 until 2008. They are known for their 10× fixed-power scopes that were used on the Marine Corps' M40 rifle and made famous by Marine Corps Scout Sniper Carlos Hathcock during the Vietnam War.
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.
The M21 remained the Army's primary sniper rifle until 1988, when it was replaced by the M24 sniper weapon system; some M21s were later re-issued and used in the Iraq War. [12] [3] In standard military use, the M21 uses a 20-round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg) without the scope. [13]
When using a scope with both mrad adjustment and a reticle with mrad markings (called a mrad/mrad scope), the shooter can spot his own bullet impact and easily correct the sight if needed. If the shot was a miss, the mrad reticle can simply be used as a "ruler" to count the number of milliradians the shot was off target.
The M40A3, a bolt-action sniper rifle used by the United States Marine Corps.Introduced in 1966, the M40 was built up from a Remington 700 bolt-action rifle.. The major components of sniper equipment are the precision sniper rifle, various optical scopes and field glasses, specialized ammunition and camouflage materials for the sniper’s body and equipment.
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.
Starting from 1941, the short 1.5× Zielfernrohr 41 (ZF41) telescopic sight was fitted to some Karabiner 98k rifles for designated marksman use. The ZF41 was the first attempt to provide the ordinary infantryman with a rifle capable of being used, if not for pure sniping, then at least for sharpshooting.