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PolarStar Gas Stock Adapter for Elite Force MP5K Airsoft Guns

ID: 25646 (ACC-HPA-10001169)
5.0 stars, based on 2 reviews
PolarStar Gas Stock Adapter for Elite Force MP5K Airsoft Guns
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The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • CNC aluminum construction
  • Direct drop-in component
  • Allows attachment of both CGS and UGS stock tubes
  • Milspec buffer tube compatible
The PolarStar MP5K Gas Stock Adapter is compatible with the Elite Force MP5K (CYMA OEM) but is also able to work with the Tokyo Marui and Galaxy models with only slight modification needed to the gun's receiver. It features internal 1-3/16 - 16 threads to accept the UGS and CGS stocks so you can build a fully contained, HPA/CO2 operated sub-gun for CQB without the need for a remote line.

This can also be used simply as an adapter to mount a standard Milspec buffer tube to your gun if you are using it with a remote line or even as an AEG. It mounts to the receiver using your exiting body pins and does not require modification to the gearbox so it does not interfere with anything. Additionally, this adapter is designed to work with Milspec (Real Steel) receiver end plates so you can configure the gun with your preferred sling plate.

The adapter is machined from a solid block of 6061 aluminum with an anodized finish making it extremely robust and durable. There is also 10-32 set screw incorporated into the design which is tightened against the underside of the buffer tube for anti-rotation thus keeping your stock indexed correctly and rock solid.

Manufacturer: PolarStar


Compatibility: PolarStar UGS and CGS stocks. Fits Elite Force and CYMA MP5K Airsoft AEGs
Material: 6061 Aluminum

About PolarStar

PolarStar Precision Airsoft was formed in January 2009 to fill a need for high quality, precision manufactured airsoft components designed for performance and longevity.The 2011 release of the patented Fusion Engine HPA system marked a change in direction for PolarStar. The focus shifted from developing upgrade components within the constraints of existing systems to developing innovative HPA systems and accessories which replace the aging AEG technology.PolarStar Airsoft is a division of PolarStar Engineering & Machine (PSE&M), a unique blend of tenured American toolmakers and a full service CAE/CAD/CAM (Computer Aided Engineering, Design, and Manufacturing), special crafts machine shop keeping alive our proud manufacturing heritage of Made in the USA. Founded in 1997, PSE&M began by servicing the automotive racing industry through the design and producing systems and components from art to part. Operating under the auspices of the Delaware Association of Professional Engineers, we retain a Professional Engineer (P.E.) on staff to ensure and certify all design and engineering standards are met. In addition to our own product line, PolarStar also offers engineering and manufacturing services tailored to the airsoft industry.

2 Customer Reviews

(Write a review)

by Robert P. on 09/28/2022
"I very much agree with the previous review. Michael really hit the nail on the head.

Much like he did, I did not HPA mine, but used it so I can use a 11.1 stick lipo in the buffer tube for my MP5k. It is currently on my EF Mp5k, and fits like a glove.

I did test it on my TM MP5k and it fit on there too. Just remember the TM body is polymer, and it would be quite easy to break the upper if you applied any pressure from the side.

Overall hard recommend, there are 3D printed options that are cheaper, and I have tried them, but nothing felt as solid as this did.

Easy 5 stars.
by Michael D. on 04/28/2022
"Hard recommend if you want a buffer tube stock for your mp5k, even if you dont HPA it. fits multiple buffer tubes i had. led a wire extension though it so i can fit other types of batteries. so your not stuck with just a stick type.

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