Airsoft players looking for the high quality inner barrel upgrade for their Tokyo Marui M4A1 MWS Gas Blowback have a good option to choose as PDI-Japan got the 6.01 Palsonite Inner Barrel for the Tokyo Marui M4A1 MWS. This is a high precision stainless steel barrel made by cold forging. Priced at ¥8,800, it has a length of 250mm, an outer diameter of 8.55mm, and an inner diameter of 6.01mm. The barrel's tolerance is ±0.002mm, and it's made from SUS304 material. This product is part of the 01 Palsonite Inner Barrel and Inner Barrel (SUS304) categories.

The 6.01mm diameter of the barrel makes it challenging to create a stable flight path like the 08 barrel because the air flow that overtakes the BB is minimal. However, this feature also results in minimal air loss, providing excellent momentum from being pushed out from the rear. These specifications make it optimal for short ranges such as pistols. The 01 barrel has a very tight inner diameter, so it's crucial to avoid using poor quality BB bullets.

Maintenance is essential for this product. There's a possibility that the barrel may be scratched or jammed due to the wax or dust from the BB bullets. It's important to note that the increase in FPS and range are not proportional. Laser marking and engraving variations depend on the production lot. Although a non-magnetic austenitic material is used, magnetic force might be induced during the manufacturing process. In some rare cases, a thin striped pattern can be seen on the inner surface, but this does not affect performance.