f2000mElement Kit Replacement for Pneumatic Plus Filter 2000 Series; Porous Platic; 10 Micron Elemt; 1 Year Limited Warranty, Manufactured in KoreaThe FN F2000 is gas-operated 5.56mm NATO bullpup rifle developed by FN Herstal and first produced in 2001. Its safety and trger mechanisms are derived from the FN P90. The F2000 was desned to be ambidextrous (only