Prometheus 6.05mm BC barrel for M4 long/type 89 (433mm)

Hi quality CNC machined solid brass inner barrel
made in japan and processed by ultra polished finish
enlarged hop packing hole and final special cone to reduce output turbolence
the Bright Coating process reduce the airloss and industrial defects....
combined with the 6.05mm +-0,01 tollerance, make the bb flight straight and far.....
suitable for MARUI, G&G, G&P, VFC, and compatible electric guns
suitable for Marui VSR-10 with chamber w type
precision inner diameter of 6.05mm
length: 433mm