FN F2000 The FN F2000 is a Belgian bullpup assault rifle created by the FN Herstal in 1995 . Description . During the late 1980s and early 1990s famous Belgian company FN Herstal began the search for its next entry into the assault rifle world . The aim this time was to produce a modern , modular weapon , and this ultimately resulted in the FN F2000 rifle , which was first displayed in public in 2001 . The F2000 offers all of the most popular features of the modern assault rifle , such as a compact bullpup layout , completely ambidextrous handling , and a modular design with plenty of options and add - ons already available , which allow the rifle to be “ tailored ” for any particular mission or tactical situation . For example , for peacekeeping operations F2000 could be fitted with less - lethal M303 underbarrel module , which fires tear gas or marker projectiles using pre - compressed air . On the other hand , the F2000 could be fitted with various 40 mm FN EGLM grenade launchers and a proprietary computerized fire control system , instead of the standard low - magnification optical sights . So far FN F2000 rifle found only few buyers , including Armed forces of Slovenia and Belgian Special operations forces . Nevertheless , it is one of most promising assault rifles on the market . Quite recently FN also introduced a civilian version of F2000 , known as FS2000 . It has a somewhat longer barrel and is limited to semi - automatic fire . Otherwise it is the same excellent weapon , with great ergonomics and 100 % ambidexterity . The F2000 rifle is a gas operated , rotating bolt , selective - fire weapon , featuring a polymer stock with a bull - pup layout . It utilizes a short - stroke gas piston and a 7 - lug rotating bolt which locks into the barrel extension . The unique feature of the F2000 rifle is its patented front ejection system : the spent cases , extracted from the chamber , travel from the rear part of the gun to the ejection port near the muzzle via a special ejection tube and fall out of the gun at the safe distance from the shooters ' face . This is achieved using a special swinging guide , which enters the way of the closing bolt , and directs the spent case , which is held on the bolt face , to the ejection tube , while , at the same time , lower lugs of the bolt are stripping a fresh cartridge from the magazine . The cocking handle is mounted well forward on the left hand side , just above the fore grip , and it can easily be operated with the right hand when the gun is held left - handed . The selector switch is mounted at the bottom of the trigger guard . All of these features combine to make the F2000 the first genuinely ambidextrous bullpup , able to be used with equal ease by right and left handed shooters without requiring any adjustments . In its standard configuration , the F2000 is perfectly balanced around the pistol grip . The stock has built - in standard rails on the top of the weapon ( for different sights and scopes etc . ) and a mounting point ahead of trigger guard , where additional modules may be installed ( such as grenade launchers , non - lethal modules etc . ) . In the basic configuration , the upper rail mount is fitted with a 1 . 6X magnification optical sight , and the lower mounting point is covered by a removable handguard . At the current time , the F2000 rifle may be upgraded , depending on the mission , with FN ' s 40 mm low - velocity grenade launcher ( on the lower mount , instead of the handguard ) , or with M303 non - lethal module ; other options are handguards with built - in laser pointers or flashlights . The standard low - magnification combat scope , which has a back - up open sights on its top cover , may be replaced by any other scope on Picatiny - style mount , or with FN ' s proprietary computerized fire control module with laser rangefinder , for both the rifle and 40 mm grenade launcher . Variants . F2000 Tactical . The F2000 Tactical railed variant is similar to the standard model , but it lacks the optical sight , and comes instead with an extended top receiver MIL - STD - 1913 rail with flip - up iron sights . FS2000 . The FS2000 is a civilian - legal , semi - automatic version of the F2000 that first became available in June 2006 . The FS2000 Tactical model is equipped with an extended barrel with a permanently attached flash suppressor and a 1 : 7 in right hand twist rifling rate ; the bayonet lug was not included on the FS2000 rifles . The lower hand guard can be removed in the same manner as the F2000 to accept the same variety of accessories . It comes with a Picatinny rail optic rail along with backup iron sights . The rear flip - up National Match - sized aperture is adjustable for windage , while the removable front sight is adjustable for elevation . A small number of the early models featured a stepped barrel contour as well as a demilled bayonet lug . Measurements on the stepped barrel ' s rifling were as long as the non - stepped barrel , revealing that the stepped barrel is not simply a shorter F2000 military barrel with an extended flash hider . A variant of the FS2000 , called the FS2000 Standard , is equipped with the factory F2000 1 . 6x magnification optic and sight cover . It does not contain the grenade launcher computer .