boresight

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boresight

[′bȯr‚sīt]
(ordnance)
A telescopic device utilizing a boresighting reticle to align the axis of a weapon with a target; it is attached to the exterior of a weapon barrel or tube by a mount.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

boresight

boresight
To align a gun or another device by optical sighting on a target. Boresight angle is the angle through which a seeker can pick up and successfully engage a target.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The time domain far-zone electric field at bore sight for new and conventional IRA is shown in Fig.
* ACOG optical bore sight, PN TA31F, NSN 1240-01-514-8428
Mounted on the base and rings before installing the scope, it allows a dealer to bore sight the scope base and rings, instead of the scope.
These are great for a rough bore sight or to check a rifle's zero after arriving at a hunting location.
Do you know of any product on the market that would allow me to bore sight a rifle at 25 yards?
Similar products are available from Stoney Point Products and Laser Bore Sight.