sight aperture

sight aperture

[′sīt ‚ap·ə·chər]
(ordnance)
An irregularly shaped, adjustable, mechanical item usually integral to a rear sight; it functions as a peephole through which the sight at the opposite end of a gun is brought into view in aiming at a target or object.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
As I viewed things, the rear sight aperture clearly encircled the round, front sight hood with the front sight bead at center.
M94 Winchester Vintage Peep Sight: When asked if I could install a cusomter's older Redfield micrometer adjustable peep sight on his top eject Model 94 .30-30 WCF rifle, my answer was right there--Yap! Darn good choice
In part one of this series, we covered how to choose the best peep sight aperture size for your applications.
Part 3 of 3: Peep Sights
I mounted a Bushnell 1.25-8x Elite 6500 scope in low Burris Signature rings for testing, and the scope cleared the rear sight aperture easily.
FIREARMS NEWS VISITS BULA DEFENSE SYSTEMS HOME OF THE LEFT-HAND M-14
Using an end mill, I opened the rear sight aperture just a bit, making it a more practical hunting sight.
Pedersoli's MortimeTarget Flintlock: Back to basics with the rifle that started it all
If it feels as though your sight aperture is simply too full, the best bet is to downgrade in pin count.
Sweat the details: address these fine points of archery gear and you'll be more lethal in the whitetail woods
I like a larger peep to center my sight aperture ring and allow as much light in as possible.
Reaching out: there is a strong argument for engaging in long-range practice sessions to improve your overall bowhunting game
Because the lowest sight aperture was 150 meters, it was expected that at our chosen range of 50 yards the rifle would shoot high.
"Man the Ramparts!" This 20mm French behemoth rifle, with its unusual loading system, was intended as a fortification defense, filling the gap somewhere between a common musket and artillery
While the hood is not present, the rear sight aperture is a finer .052 inch.
A better mousetrap: Springfield's M1A gets some key upgrades that take the iconic design to a new level
Slide the sight aperture all the way forward, remove the hinge pin at the front and voila, the leaf slides out and the new one slides in.
Contemptibles
Long-gun accessory offerings for 2012 include the AR-15/M16 Same Plane Sight Aperture, Offset Flashlight Rail Mount, Single Point Sling Adapter, AR-15/M4 Storm Sling Adapter and Twist Lock QR Sling Swivel.
BLACKHAWK!
Put one or two drops of CLP in the hole in front of the rear sight aperture and on each knob.
The whole PM deal
To overcome gravity, the rifle is angled slightly upward, but the LOS is not because, by definition, it is a straight line from the eye, through the sight aperture or optic to the target.
A primer on exterior ballistics for Infantrymen
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