and sear are disabled. The G41 uses NATO STANAG magazines (from the M16 rifle) with a capacity of 30 rounds. The magazine release is located on the left side of the rifle, above the magazine well. The weapon incorporates a manual forward assist that can be used to positively close the bolt, similar to the one used on the American M16A1 rifle, and a side-folding heavy-gauge wire carrying handle near its point of balance which resembles that of the FN FAL. It also has a "hold-open" bolt catch which holds the bolt open after the last round in the magazine has been fired (the bolt release button is just above the magazine release) and has a spring-loaded polymer dust cover that seals the ejection port from debris. Despite reducing the weight of some components the weight of the HK41 exceeded the weight of the preceding G33, making the HK41 relatively heavy compared to other 5.56×45mm NATO chambered assault rifles of its era. Barrel The cold hammer-forged barrel has a hexagonal polygonal bore. It comes rifled for either the NATO-standard, Belgian SS109 62 grain bullet with a twist of 178 mm (1:7 in) or in a 305 mm (1:12 in) twist for use with American .223 Remington/5.56×45mm ammunition with the M193 55 grain projectile. The bore chamber is fluted to assist in the extraction of spent cartridges. The barrel is equipped with a flash suppressor that is also designed to launch rifle grenades. Sights The firearm is equipped with a relatively low iron sight line that consists of a Drehvisier a rotary rear drum and hooded front post. The rear sight is mechanically adjustable for both windage and elevation with the help of tools. This deliberately prevents non-armorers to (re)zero the iron sight line. The rotary drum features an open V-notch (numbered 1) for rapid target acquisition, close range, low light and impaired visibility use and three apertures (numbered 2, 3 and 4) used for: in increments for more precise aiming. The 1 V-notch and 2 or aperture settings have an identical point of aim. The V-notch and apertures are calibrated for 5.56×45mm NATO ball ammunition. The receiver housing has a NATO pattern optics mount (meeting STANAG 2324) that replaced HK’s claw-mount system used to mount day (typically the Hensoldt 4×24 telescopic sight) or night aiming optics. The Hensoldt Fero 4×24 telescopic sight and mount assembly were developed for designated marksman