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[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]
  • SKU: NG0MP5A29

[KM Project] Tokyo Marui Next-Gen Electric Gun H&K MP5/A4/A5/SD6 / EVOLT M4A1 Carbine/FPR-Mk4 Compatible Large Bore Rectifier-Equipped TN Barrel L229mm [NG0MP5A+29]

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Product Description
This large-bore rectifier TN barrel is compatible with Tokyo Marui next-generation electric guns: H&K MP5A4 / MP5A5 / MP5SD6, and EVOLT M4A1 Carbine / FPR-Mk4.

This product combines a 229 mm TN barrel with an integral 29 mm large-bore section at the muzzle end, with a 7.5 mm inner diameter. It combines the accuracy of a high-precision TN barrel with the rectifying effect of the large bore.


▍Specifications

Item Details
Compatible models Tokyo Marui next-generation electric guns: MP5A4 / MP5A5 / MP5SD6 · EVOLT M4A1 Carbine / FPR-Mk4
Material Brass
Surface treatment TN coating
Overall length 229 mm
TN barrel inner diameter 6.04 mm
Large-bore section inner diameter 7.5 mm
Outer diameter 8.5 mm
Large-bore section length 29 mm


▍Product Development

Developed and manufactured in Japan


▍About TN Barrels

KM's flagship product, the TN barrel, is made from carefully selected brass and finished with our proprietary TN coating. Our unique manufacturing process electro-deposits the coating on the inner surface, adjusting its thickness to produce a barrel with an exceptionally consistent inner diameter based on a 6.04 mm specification.


▍History of TN Barrels

Since its launch in 1989, the TN barrel has remained a popular long-selling series. Its high quality and dimensional accuracy, achieved through fully integrated domestic production, have made it a favorite among airsoft users.


▍HOP Groove Machining

HOP grooves require extremely precise machining.
Most conventional HOP grooves are machined using an end mill on a lathe or similar machine.
Although our process takes more time and costs more,
we machine each HOP groove individually using a submerged electrical discharge machining (EDM) machine.
*Some products with HOP grooves that are part of a hole or similar feature are machined with an end mill.


▍TN Coating

TN coating is a special Teflon-based coating blended with several types of additives.
It offers excellent abrasion resistance and smoothness, and is more durable than standard electrodeposited plating.
TN coating resists dirt and is easy to maintain, so it does not require particularly meticulous care. To maintain performance, simply clean dirt from the inner barrel periodically using a maintenance rod.


▍Large-Bore Rectifier System

A 29 mm section with a 7.5 mm inner diameter is located at the muzzle end.
After spinning and accelerating through the high-precision TN barrel with its 6.04 mm inner diameter, the BB passes into the 7.5 mm large-bore section, where it does not make contact with the barrel.
This section smooths the flow of compressed air following the BB, reducing turbulence near the muzzle and unwanted lateral forces on the BB. This design is intended to improve trajectory stability through a rectifying effect.


▍Firing Performance

The TN coating's excellent smoothness and the high-precision 6.04 mm inner-diameter design minimize resistance as BBs pass through, while aiming for consistent muzzle velocity, tighter grouping, and a straighter trajectory.
In addition, the 29 mm large-bore rectifier section at the muzzle end smooths the airflow just before the BB is fired. Combining the acceleration and stabilization performance of the high-precision TN barrel with the rectifying effect of the large bore, this model is designed to improve trajectory stability and grouping at medium to long range.

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