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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.
For a ring assembly to grip evenly, it is important that the scope rings are circular and coaxial with the scope tube. On ring mounts that grip unevenly, the ring mount can be lapped to prevent uneven pressure when mounting. [15] One scopes made for ring mounts, it is not uncommon to get ring marks when mounting the rings.
Field-crossbow archery was first adopted by the IAU during their General Assembly at Frütigen, Switzerland in 1977. Since then the sport has become the most popular, in terms of worldwide activity, of the IAU's three target crossbow disciplines. A feature of this sport is that many crossbow archers make their own equipment.
It takes data from thousands of tables and accounts for a number of real-time external factors automatically giving the shooter the exact yardage at which a bullet will hit its target. [ 1 ] Since the BORS is mounted directly to the scope and coupled with the elevation knobs, the computer can interact with the scope by simply turning the ...
A long-range laser rangefinder is capable of measuring distance up to 20 km; mounted on a tripod with an angular mount. The resulting system also provides azimuth and elevation measurements. A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object.
The Chinese crossbow had a longer power stroke, around 51 cm (20 in) or so, compared to the early medieval European crossbow, which typically sat around only 10–18 cm (3.9–7.1 in). This was made possible by the more compact design of the Chinese trigger, which allowed it to sit further back at the rear-end of the tiller.
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