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FN F2000 Chambered in 5.56x45mm NATO (223 Rem.), the FN F2000 Series are cutting-edge selective-fire bullpup carbines. The F2000 Standard comes equipped with a 1.6x optical sighting package. The F2000 Tactical offers an integrated MIL-STD 1913 top mounting rail and emergency backup folding sights. Both of the F2000 carbines are gas-operated and use a rotating bolt lockup for reliability and greater accuracy. Both variants have 15.75" cold hammer-forged MIL-SPEC barrels and muzzle brakes. Fired cases are ejected through a forward port away from the operator. 30-round detachable box magazines (DBM) are standard. The fully-ambidextrous polymer stock is available in matte black. An optional tactical fore-end accessory provides three forward MIL-STD 1913 rails for mounting tactical lights and lasers
Check out where the spent casing ejects.
And field stripped.
Pretty cool bullpup by FN.