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. Also about the design, it’s the best for AEG chamber & has a tapered muzzle end like Guren 2. The tapered muzzle makes better accuracy & FPS. 
Dia. : 6.05mm Outer Dia. : 8.55mm HOP window length 6mm 6.05mm is good balance, not too tight & too loose 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) Also Tokyo Marui original bore is approximately 6.08mm so compared to Marui, 6.05mm is a tight bore. It has a little clearance between BB & wall. So BB is reduced touches of the wall when go through the barrel. So less friction ＆ unnecessary spin , Consequently accuracy will be improved.
Soft fit for HOP rubber
The upper side , cut 45 degree to be soft for rubber.
Of course, you can use for Tokyo Marui AEG.
The chamfer size in the drawing is the target value.
The chamfer size may vary due to tool wear or material outer diameter tolerance.
Additionally, the chamfered area may become rounded during polishing.
HOP rubber is mold injection, So it may happen small round for the edge inside. Then you can’t push the barrel to the correct position so Raizen made a bit bigger chamfer there. So you can push the barrel to original position completely. 
Easy fit to the chamber cause outer DIA. is 8.55mm around. You can put it by C clip parts. What’s the difference between Raizen & R-code barrel ? R-code barrel was designed to R-HOP unit. Raizen is based on Marui original rubber, Please select to make your concept.
New generation MP5A5 is only unique design. It has no compatibility with others.
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