VFC KNIGHT GAS BLOCK ₩17,000
VFC Gas Tube-M4(210mm) ₩14,000
VFC Gas Tube - 7" (181mm) ₩12,000
Madbull Noveske Rifleworks Adjustable Gas Block for M4/M16 Barrel ₩39,000
Madbull Noveske Rifleworks Gas Block for M4/M16 Type Barrel ₩26,000
G&P M4 Gas Tube ₩15,000
King Arms M4 Gas Tube ₩13,400