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The Remington Model 521 TL Junior is a member of the Remington 500 series rifles. [1] It is bolt action with a walnut stock and a 24 in (61 cm) barrel. It has a Lyman aperture rear sight that is adjustable for elevation and windage.
The flip-up adjustable Lyman rear sight was replaced with a fixed L sight. Late M1s had triangular guard wings added to the rear L sight, which were standardized on the M1A1. The slots adjoining the magazine well allowing the use of a drum magazine were removed.
With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
The company grew to be a foremost manufacturer of gun sights, competing with rivals such as Lyman ... U.S. patent 450,468 Adjustable Gun-sight; ... 894,275 Rear Sight;
Rear, rotating diopter drum sight of a SIG SG 550 service rifle.The viewing aperture above the "3" (denoting the 300 m setting) can be seen. The diopter is in principle a vertically and horizontally (elevation and windage) adjustable occluder with a small hole (aperture), and is placed close in front of the shooter's aiming eye.
The most common of these was the Lyman 48 series: the 48-J and -JH for flat-top dovetail-mount receivers, and the 48-F and -FH for round-top side-mount rifles (standard on the 52 Sporting Model). Other popular sights were the Lyman 525, the Wittek-Vaver 35-MIELT, the Marble Goss 52, and the Redfield 90 and 100.