[da Vinci Custom] 05 Raizen M4A1 MWS Compatible Inner Barrel 250mm

*Please note that this item is made to order and will take approximately 1-2 weeks to be shipped after your order is placed.

05 Raizen inner barrel
Overall length 250mm (M4A1 MWS, Type 89 rifle)
Inner diameter 6.05mm
Outer diameter 8.55mm
SUS304

*O-rings are not included, so please use genuine O-rings or O-rings available from our company.

The industry's highest quality SUS304 barrel, the "Raizen" series
The Raizen barrel is made from the ultra-precision material "SUS304" produced using Japan's proud semi-conductor manufacturing technology.
Our unique surface roughness setting with a tolerance of ±0.005mm was achieved through collaboration with a company headquartered in Tokyo.
For machining, we use Star Micronics multi-tasking machines - 8 axes (X, Y, Z1, A, B, C, E, Z2) - and use the optimal tools to cut and reproduce the drawings down to the smallest detail. For the finishing polishing, we use machines and craftsmen in a system that does not allow for any compromise, resulting in a quality that cannot be imitated by other companies.

6.05mm: A good balance of distance and accuracy
The 6.05mm inner diameter is narrower than that of 6mm BB bullets, but it is not too tight, so it receives air pressure from behind while reducing the number of times the bullet hits the inner wall, resulting in an excellent balance between long flight distance and high accuracy.
It is resistant to scratches and stains that are unique to stainless steel, and maintains a beautiful surface for a long time, ensuring consistent output.

Special tapered processing for improved performance
The muzzle has been tapered, just like the Guren 2. The tapered design allows air to be efficiently expelled, converting it into energy that pushes the bullet forward, while creating a straightened airflow and improving accuracy.

MWS muzzle side tapered processing image

The design of the chamber side is based on the OEM. Taking into consideration interference with the chamber packing, a smoother R processing has been applied.

MWS chamber side

At Raizen, we have established an internal diameter inspection point "after polishing" as an inspection standard .
In particular, we physically check to see if any burrs generated during processing have affected the inner diameter.
The polishing is then checked again by the "human eye" of a select few craftsmen in charge of polishing.
Up to this point, the items are the same as those for Guren, but the surface roughness pass criteria are one level stricter, and roughness that occurs in the material is strictly selected.
The reason why Raizen is a high-end barrel is not only the cost of the materials, but also the time it takes to select them and the amount of rejected material.
Therefore, the bottle you receive will be a carefully selected item.
Regarding patterns (cutter marks, blade marks, etc.) that occur during processing and do not affect use,
After going through the above checks, the craftsman has given his permission, so please use it with confidence.