sight leaf

sight leaf

[′sīt ‚lēf]
(ordnance)
The movable hinged part of a rear sight of a gun that can be raised and set to a desired range, or snapped down when not in use.
References in periodicals archive ?
Better than an AK, the 3-point, fiber-optic sight picture features two green dots on the rear sight leaf and a red front blade.
75 pounds Magazine: Eight-round, tubular Sights: Front-Square block with groove Rear-U-notch adjustable from 400 to 2000 meters* Bayonet: Epee-Ba'i'onnette Modele 1886 with 16-inch cruciform blade *- the rear sight leaf could be folded forward to expose a 250-meter battle sight.
The stock Ruger is supplied with a excellent set of adjustable target sights; however, if you wanted a iron sighting system geared more toward hunting and plinking and the acquisition of a faster sight picture, Majestic offers a Hi-Viz Express Sight system replacing the front sight ramp with a light tube and the existing rear sight leaf with a shallow "V" express leaf.
Despite the changes made to the rear sight leaf and the addition of sling slots in the stocks, large numbers of the earlier pattern remained unaltered in combat throughout WWI.
To correct the rear sight leaf for the 8x57mmS cartridge, the face of the ladder leaf was milled away and a thin plate with the correct range was brazed onto the original leaf.
The wartime Gew 88S conversions begun in 1915 and included the renumbering of the rear sight leaf to match the trajectory of the spitzer bullet of the "S" cartridge.
It's both a notch and a small aperture accessed by flipping the L-shaped sight leaf to the desired position.
In 1993 the Model 57-4 was introduced and this was the model that featured the sight leaf with the round spring now seen on all the adjustable-sight models as well as the drilled and tapped frame.
Should breaking off the adjustable rear sight leaf be an issue for you or if you simply want the handgun to be more durable, try replacing the adjustable rear sight with fixed rear sights as I did on my S&W 325s with great success.
For ranges beyond this, the sight leaf was raised perpendicular to the barrel and the push-button sight slide was adjustable.
The exquisite checkering found on the top strap, rear sight leaf and the ribbed barrel of the Model 27 is gone, replaced by a grooved barrel rib and a grooved rear sight leaf with a smooth top strap.