In full-bore, competitors use heavy rifles and riflescopes, whereas in BR50 a weight limit is specified. In BR50, small-caliber rifles (.22 LR) are paired with lightweight riflescopes, commonly with a tube that measures 1 inch (25.4 mm) in diameter.
Since benchrest competitors shoot at a known distance, the parallax is only set once, at the very beginning of the competition. The difficulty to reach the adjustment ring while in the shooting position is thus an unimportant factor. Having the parallax setting on the objective is handy because it allows the user to set the parallax more precisely (the larger the knob, the more precise the adjustments). Furthermore, manufacturing an adjustable objective is less complex than manufacturing a riflescope with a side focus, which is why AO riflescopes are usually cheaper. It also requires fewer parts, resulting in a lower mass.
When it comes to fixed power riflescopes, Sightron and Weaver are the most popular choices. Other well-known manufacturers of such riflescopes are Leupold, March, and IOR. These riflescopes often feature a 1-inch (25.4mm) tube but a 30mm tube is also used by some manufacturers. Fixed power riflescopes are advantageous over variable magnification riflescopes in certain aspects; they are lighter and optically better for the price.
In benchrest disciplines where mass is not to be considered, shooters opt for a heavier riflescope, usually with a tube diameter of 34 mm and a high maximum magnification. A 10–50x magnification range is a common choice, as well as a thin reticle, and 1/8 MOA clicks for maximum precision. Sightron has the most of the market's share in this category, but certain Kahles, Nikko Stirling, and Hawke riflescopes are also popular.
Vortex SCR-1 reticle