Laylax Nine Ball 6.00mm Power Inner Barrel for TM M4A1 MWS GBB (6.00mm - 370mm)

The Tokyo Marui M4A1 MWS GBB series is renowned for its reliability, but expanding its power and effective range requires optimizing gas efficiency. The Laylax Nine Ball 6.00mm Power Inner Barrel for TM M4A1 MWS GBB (370mm) bridges the gap between stock gas consumption and maximum output, delivering elite-level accuracy and velocity gains for serious GBBR marksmen.

Ultra-Tight 6.00mm Bore Engineering

Standard factory inner barrels allow a significant volume of gas to escape around the BB during discharge. By narrowing the internal diameter to an ultra-precise 6.00mm (with a tight ±0.01mm manufacturing tolerance), this barrel seals expanding gas directly behind the BB. This enhanced pneumatic air containment translates into an immediate boost in muzzle velocity (FPS) without requiring high-flow gas valves or stiffer spring setups, keeping your system gas-efficient and reliable.

Japanese Stainless Steel Construction & Mirror Finish

Crafted in Japan from high-strength stainless steel (SUS), this barrel offers complete resistance to bending, surface corrosion, and internal wear. The interior bore is mirror-polished to minimize friction as the projectile travels down the 370mm length, preserving backspin stability imparted by your hop-up rubber. Precision-machined outer indexing keyways ensure a seamless, drop-in fitment with Tokyo Marui MWS hop-up chamber units.

Key Features & Technical Benefits:

• Ultra-Tight 6.00mm Internal Bore: Maximizes gas compression for an immediate boost in FPS and energy output.

• SUS Stainless Steel Build: Premium Japanese construction provides unyielding rigidity and long-term durability.

• 370mm MWS-Tailored Length: Engineered specifically for full-length Tokyo Marui M4A1 MWS GBB receiver assemblies.

• Mirror-Polished Internal Bore: Reduces surface drag to ensure smooth BB travel and consistent backspin retention.

• Direct Drop-In Integration: Matches factory TM hop-up chamber geometry for effortless alignment and installation.

Installation & Field Guidance

Due to the ultra-tight 6.00mm internal diameter, it is essential to use only high-grade, seamless 5.95mm competition BBs to prevent barrel jams. Before seating the barrel into your MWS hop-up chamber, clean the internal bore using a microfiber cloth and rubbing alcohol to remove any protective packing oils. Ensure your hop-up bucking is aligned straight along the barrel keyway to prevent side-spin trajectory shifts on the field.