This set is for adapting an MK Mechbox to an AR/M4 type receiver. 


Kit Includes:

Custom T-Piece, O-Ring seal for barrel (Brass)

Custom threaded metal outer barrel adapter (Aluminium)

Custom Nozzle (Aluminium)

Gold Series Barrel (up to 500mm)

Free Delivery


This kit allows you to install an MK mechbox into any AR/M4 reciever with the exception of the JinMing Gen 8/9 or Wells. The components supplied are all made to our BM1 spec and meet the tolerances required to successfully operate the blaster once complete.

The Kit is compatible with all aftermarket threaded metal outer barrel systems currently available and have 14.0mm x 1.0mm LH threads. 

The custom made T-Piece is capable of a higher flow rate with zero chance of clogging.

The lightweight nozzle has been machined to match the T-Piece which provides support and prevents latteral movement. This reduces friction and wear on associated components.

Will accept all inner barrels of 9.5mm outer diameter. Two o-rings are used to seal the barrel in the T-Piece thus making it easier to remove the barrel for cleaning and maintenance.


There are many features and benefits to utilizing this set, not only does it relieve you of the frustration from working out what components are required for this type of build but the performance increases open up endless posibilities.

The entire front end is significantly improved. The design of the assembly adds strength to surrounding components. The results are:

  • smoother operation,
  • reduced wear on components,
  • less friction,
  • higher cyclic rates,
  • lower power consumption
  • higher muzzle velocities
  • greater consistency of shots
  • zero loss of charge pressure
  • greater range and accuracy
  • less frustration and more fun.


By utilizing the nut that your hand gaurd mounts to on the front of the reciever to push the T-Piece up against the front of the box, the T-Piece is held firmly in position and perfectly in line with the nozzle. The assembly is made with quality materials and is over engineered to never, ever let you down. the assembly is adjustable to accomodate the minor differences in receivers and to allow you to adjust the pressure applied in the T-Piece to box connection.


This system has been in production for quite some time now but reserved for use only on our personal builds and customers high end blasters. With the growing popularity of custom builds and quality metal Mechboxes being installed, the missing link is the centre of the blaster. The T-Piece combines the charge created in the mechbox with the gels fed from the magazine and feeds it all down the barrel. To skimp on this component would be like using a Daewoo gearbox in a Porche!


There is a certain level of skill required to perform modifications of this nature and whilst we can gaurantee that when properly used these products will outperform all others we cannot gaurantee workmanship other than our own. If you are unsure of your capabillities or do not have the necessary tools required to carry out such modifications we advise that you seek assistance.


These products have been tested and have proven reliable in extremely high performance builds of both muzzle velocity and cyclic rate. We accept no liabillity for damage should any failure occur. We will however provide assistance and advice for matters relating to our products if required.


As with all Bruisemaster products you are covered by our replacement warranty and entitled to free support. Please keep in mind when purchasing that our products are made to order and allow up to ten business days for your items to be made and sent. We send via express post and all items are tracked. Thank you

MK - AR/M4/HK416

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