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The rifle comes with adjustable iron sights, consisting of a forward post and an L-shaped dual-aperture rear flip sight with settings for firing at ranges of 150 and 300 m. [1] The front sight, corrected for windage and elevation, is mounted in a semi-shrouded post on top of the gas block, and the rear sight—on the receiver top cover.
It is a derivative of the Zastava M70 [4] and modified copy of the Soviet AKM [1] chambered in 7.62×51mm with an enlarged receiver, [4] and a Western-style flash suppressor. It is gas-operated, air-cooled, magazine-fed, selective fire battle rifle with a fixed wooden stock. The M77 AB1 has a folding stock. Early versions had a milled receiver ...
The FNC's barrel features a flash suppressor that is also used to launch NATO standard 22mm rifle grenades (only the standard rifle model has this capability). The gas block contains a gas valve setting that is used to isolate the gas system, providing an increased volume of propellant required to fire a rifle grenade.
This rifle uses a midlength short stroke gas piston system to reduce recoil and increases the speed of follow up shots. [13] It features an adjustable gas system to allow the user to adapt the rifle to different conditions and is designed to accommodate optics such as scopes and reflex sights. The A3 integrates a gas block using a flip up front ...
The use of a suppressor also increases gas pressure, further aggravating the situation. The problem can be reduced by using a longer gas tube, moving the gas port on the barrel further forward, and/or by installing an adjustable gas block to provide the right amount of gas pressure depending on the desired operating mode. [1]
The gas system features suppressed and unsuppressed settings. Unlike the handguard of the MCX, which slides off after pulling the front pivot pin, the MCX-MR requires popping off two screws first. It features both an M16/AR-15 type charging handle and a left side charging handle.
The Minimi has a manually adjustable gas valve with two positions, normal and adverse. The adverse setting increases the cyclic rate of fire from 700–850 rounds per minute to 950–1,150 rounds per minute and is used only in extreme environmental conditions or when heavy fouling is present in the weapon's gas tube.
The sights consist of a rear, rotating diopter drum soldered to the receiver and a hooded front post installed in the gas block. The rear sight has an open notch setting marked "1" designed for immediate firing up to 100 m but also contains apertures with settings "2", "3" and "4" corresponding to 200, 300 and 400 m firing ranges.