a pin on the moving bolt carrier upon its forward return. Only when the ejection tube contains more than five cases is the first of them ejected forward through a port just behind and to the right of the muzzle. This is continued; every fifth round fired, all five shells are ejected in a burst, until the magazine is empty. Thus a 30-round magazine will be ejected in six bursts of five shells. This system is patent protected (patent number 5675924 dated 14 October 1997 by René Predazzer and patent 6389725 from February 25, 2000, author Charles Denuit). The ambidexterity provided by forward ejection is its most obvious benefit, and removes many of the tactical and user difficulties (such as lack of ambidexterity, and gas and debris released in close proximity to the shooter's face, as in the SA80 or OC-14) that bullpup designs usually create. Grenade launcher One of the modules developed for the F2000 system is a proprietary lightweight 40 mm underslung GL1 grenade launcher (empty weight 1 kg) that uses standard low-velocity 40×46mm grenades. The launcher is a single-shot breech-loaded reverse pump-action weapon with a barrel that slides forward for loading and unloading (like the M203 grenade launcher), locked by axial rotation of the barrel. The grenade launcher's trigger is installed directly under the F2000's trigger so that it can be manipulated without removing the shooting hand from the rifle's pistol grip. The double-action trigger lets the operator "try again" if the grenade's percussion type primer doesn't ignite. The breech release button is found on the left side of the launcher body, like on the M203. The grenade launcher comes with a basic flip-up ladder sight, but it was intended to be used with a specially designed optoelectronic fire control system designated FCS, developed in cooperation with the Finnish company Noptel. The aiming module is installed in place of the standard optical sight and becomes the weapon's primary sight when mounted, but its main purpose is to accurately determine and indicate the range of a grenade target. The module is powered by a 9 V battery pack, installed in the stock, behind the magazine well. The power pack is also intended to power any other tactical accessories or systems that could be introduced. The FCS integrates a low-power laser rangefinder (precise to within ± 1 m), a day-time aiming channel with an electronically projected reticle, a measured