Piston head AEG POM (plastic)


A very lightweight AEG piston head designed with 2 O-rings and 11 counter-pressure holes. Made from high quality POM-C plastic. The piston head uses a steel axial ball bearing for smooth operation. The combination of well thought-out design and the material used ensures perfect performance and long lifetime on springs with up to SP150 power. The piston head’s low weight helps to prolong the gearbox lifetime. Read more


14,60 €

Warehouse number: E310-POM

Producer: EPeS airsoft

  • A plastic piston head for springs up to SP150
  • This piston head is fitted with two high-quality O-rings (one guiding and one sealing)
  • 11 counter-pressure holes with proportional geometry for perfect tightness inside the cylinder
  • A ball bearing for problem-free spring operation
  • A special screw connection between the piston head and piston via a thread placed on the bearing's flange made from aircraft-grade duralumin
  • The weight of the piston head only is 3 g, the weight of the complete assembly with the bearing, flange and bolt is 9.1 g
  • Made from high quality POM-C plastic, which offers very low friction coefficient and high stiffness
  • O-rings made from NBR 70 sh rubber
  • Made in the Czech Republic


Package contents

  • 1 piston head with fitted guiding and sealing O-rings (16×1 and 19×2.5)
  • Additional guiding and sealing O-rings for cylinders with wider inner diameter (18×1 and 19×2.65)
  • 1 axial bearing
  • 1 bearing flange with thread for the piston head mounting bolt
  • 2 high strength bolts (M3×16 with Phillips and Torx heads)


Low weight, high strength

During the design phase of this plastic piston head, we set two main criteria – low weight and high strength. In order to achieve the low weight, the mounting bolt of the piston head is inserted from the front of the head. The thread used to secure the piston head is not inside the head itself, but rather on the flange of the piston head's axial bearing. Otherwise, the thread would have to be cut into the plastic material of the piston head. This would not be a good solution for repeated mounting and dismounting. Alternatively, we could have used a duralumin threaded insert inside the plastic, but this would increase the weight of the head, which would then negatively impact the performance of the part. We decided to choose the most optimal solution.


Advanced geometry of the counter-pressure system

The piston head uses the so-called counter-pressure design – an established contemporary standard. Regardless of that, we were able to push the proven design a little bit further.

The EPeS piston head features 11 air intake holes for the sealing O-ring. The placement of these holes has been selected to maximize the flat surface in contact with the piston head's impact rubber pad, while keeping excellent compression attributes. The larger the functional area of the impact rubber pad, the more effectively the impacts are absorbed. This results in quieter operation of the gun and also increases the pad's longevity.

The edges of the EPeS piston head intake holes are rounded to an ideal aerodynamic shape for efficient air intake towards the sealing O-ring and for the disruption of sharp transition between the flat piston head's front side and the hole's inner cylindrical surface. This sharp corner transition is, in most cases, the reason for rubber pad damage.

Discussion 0

No comments

New comment

Rating 0

Product rating



No comments

New product question



New comment



Alternative products

Privacy preferences
We use cookies to enhance your visit of this website, analyze its performance and collect data about its usage. We may use third-party tools and services to do so and collected data may get transmitted to partners in the EU, USA or other countries. By clicking on 'Accept all cookies' you declare your consent with this processing. You may find detailed information or adjust your preferences below.

Privacy declaration

Show details
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


new eshopEshop was moved to a new domain:


Product has been added to the cart
Continue shopping Order