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For Tokyo Marui M4A1 MWS , Type89 (GBB)
Inner Dia. : 6.01mm
Length : 250mm

Material : Stainless steel (SUS304)
Inner Dia. Torelance : +-0.005mm
Outer Dia. :  8.55mm

Description

Raizen is made of precise stainless steel which was the finest quality in Japan.
We’ve used this material for 20 years to create the best barrel.

Raizen has a tapered muzzle end.
The tapered muzzle makes better accuracy & FPS.

Dia. : 6.01mm
Outer Dia. :  8.55mm

6.01mm is the finest tight bore.
The material has a tolerance. Stainless steel is the most precise material. This material has +-0.005mm tolerance.
It’s the finest quality in Japan (I can say in the world) So we can achieve 6.01mm bore. If make under 6.01mm, it’s possible to stuck BB in the barrel cause BB outer dia is 5.95mm. Please imgae, BB was made by plastic so can’t keep good tolerance.
So we think 6.01mm is the best choice for the tight bore,
6.01mm gain the FPS to be less air leak.