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GUARDER NBU (Bore-Up) Cylinder Set for M16

GUARDER NBU (Bore Up) air seal system for M16 is a complete upgrade set with increased air volume for M16 AEGs based on the Tokyo Marui standard. It includes a chrome-plated cylinder, silent ventilated piston head with bearing, stainless steel cylinder head with dual seal and sealed nozzle. The set weighs 78 g and is designed primarily for higher-performance builds with M120 and stronger springs.

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34,21 € tax incl.

-18,65 €

52,86 € tax incl.

-35%

Anareus 25 let

25+ years of proven equipment and accessories.

Availability: In Stock at store

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GUARD197

: GUARDER

Accessories

GUARDER NBU (Bore Up) Air Seal System for TM Standard M16

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are tied to the anareus.cz domain.GUARDER NBU (Bore Up) air seal system for Tokyo Marui standard M16 is a complete NBU set that uses a larger inner diameter than a standard air seal system, providing a larger air volume. The set includes a chrome-plated cylinder with a ribbed surface, silent ventilated polycarbonate piston head with ball bearing, S303 stainless steel cylinder head with dual seal and nozzle with a sealing O-ring. All four parts are dimensionally matched to the Bore Up system and form one complete system. An M120 or stronger spring is recommended to utilize the larger air volume. With the long M16 platform, however, it is equally important to correctly match the cylinder volume to the length and volume of the inner barrel. During installation, we recommend checking the seal of the entire air seal system, correct nozzle operation and reliable BB feeding. Installing an NBU (Bore Up) set alone does not automatically guarantee higher performance – the resulting effect depends on the entire gun configuration.

Key Features

Complete NBU Air Seal System

The set includes an NBU (Bore Up) cylinder, cylinder head, piston head and nozzle. The parts are dimensionally matched for use together, so there is no need to select the individual NBU system components separately.

Larger Air Volume

The NBU (Bore Up) system uses an increased inner diameter, allowing the cylinder to hold more air than a standard design. This can be utilized in properly designed higher-performance builds.

Chrome-Plated Cylinder

The NBU (Bore Up) cylinder features a chrome-plated and ribbed surface. Together with the other NBU components, it forms an air seal system designed for a larger working air volume.

Focus on Air Seal

The stainless steel cylinder head with dual seal and nozzle with O-ring help reduce air leakage at critical connections within the air seal system.

Silent Piston Head With Bearing

The ventilated polycarbonate piston head features a silent design and a ball bearing that allows the spring to rotate more freely during compression.

Technical Specifications

  • Type: complete Bore Up / NBU air seal system
  • Materials: S303 stainless steel / brass / polycarbonate / acetal
  • Cylinder: Bore Up, chrome-plated, ribbed surface
  • Cylinder head: Bore Up, S303 stainless steel, dual seal
  • Piston head: Bore Up, polycarbonate, silent, ventilated, with ball bearing
  • Nozzle: Bore Up, with sealing O-ring
  • Nozzle length: 21.17 mm
  • Recommended spring: M120 and stronger
  • Weight: 78.4 g
  • Compatibility: Tokyo Marui standard M16

Package Contents

  • 1× GUARDER chrome-plated Bore Up cylinder
  • 1× GUARDER Bore Up cylinder head with dual seal
  • 1× GUARDER Bore Up silent ventilated piston head with ball bearing
  • 1× GUARDER Bore Up nozzle with sealing O-ring

Frequently Asked Questions (FAQ)

What Does NBU / New Bore Up Mean?

NBU stands for New Bore Up. It is an air seal system with an increased inner diameter, allowing the cylinder to hold a larger volume of air. The other components of the Bore Up system are dimensionally matched accordingly.

Which Spring Should Be Used With This NBU (Bore Up) Set?

An M120 or stronger spring is recommended to utilize the larger air volume. As performance increases, the gearbox, gears, piston and other stressed parts must also be appropriately selected for the increased load.

Why Can NBU (Bore Up) Be Useful in an M16A2?

The M16A2 uses a long inner barrel, so in a properly designed build, the larger Bore Up cylinder volume can be used to correctly match the air volume of the air seal system to the barrel. However, this always depends on the specific length and inner diameter of the barrel used.

Will the NBU (Bore Up) Set Automatically Increase Gun Performance?

No. NBU (Bore Up) provides a larger air volume and a well-sealed system, but the resulting performance depends on the entire configuration. The spring used, air seal, barrel volume and proper matching of all gearbox parts are decisive.

VariantsM16
ColorCombination
Piston headPlastic
NozzlePlastic