Description:
For Tokyo Marui M4A1 MWS / M4A1 Carbine / M4 CQBR / Type89 / MTR Gas Blow Back Rifle.
Inner Diameter:6.01mm
Outer Diameter:8.55mm
Material: STKM-12C-EC
Tolerance: +-0.007mm
PDI adopts QPQ to give the sear durability, anti-rust, and blacken. Particularly, QPQ's corrosion-resistance, fatigue-endurance, and abrasion- resistance are better than hard chrome plating
