The range adjusting drum can be locked in any elevation providing exact range targeting and preventing inadvertent movement once the range is selected. The GMG Granatmaschinengewehr or grenade machine gun is an automatic grenade launcher developed by Heckler & Koch for the German Army. The range drum is fitted with a top mounted sight rail with two side mounted rails for auxiliary equipment such as lasers and range finding equipment. Its maximum effective range is 1,500 meters. ![]() The grenades are belt-fed into the GMG from a 32 round box. The range drum is fitted with a quick release (QR) female dovetail mounting bracket, commonly referred to as a rail grabber which allows rapid fitment and adjustment to the Picatinny pattern mounting rail on the bridge of the GMG soft mount. It fires high-velocity 40x53mm grenades at a rate of 340 rounds permit. The GMG fires 40mm high explosive grenades up to 2km at a rate of 340 rpm. The range scale is graduated from 0 to 2000 m and is fitted with a GTLS on the range and zero lines to aid setting the range under low light levels. The sight mounting rail is tilted slightly to the right from the horizontal to compensate for drift caused by the spin of the projectile. ![]() The range drum (3805) is optimised for the various natures of 40mm munitions currently available.
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