Epes Piston head for AEG POM (plastic)

Very light piston head for AEG with two O-rings and 11 counter pressure holes, made of high quality POM-C plastic. It is equipped with a steel axial ball bearing for smooth operation. The combination of construction and material used ensures perfect performance and high durability on springs up to SP150 strength. The low weight of the piston head helps extend the life of the gearbox.

Plastic piston head for springs up to SP150
-The head is equipped with two high-quality O-rings (guide and sealing)
-11 counter-pressure holes with sophisticated geometry for perfect tightness in the cylinder
-Ball bearing for trouble-free operation of the spring
-Special connection of the piston head to the piston using a bearing flange made of aerospace duralumin with a thread
-Weight of single head only 3g and 9.1g including bearing, flange and screw
-Made of high-quality POM-C plastic, which has a very low coefficient of friction and high strength, O-rings made of NBR 70 sh
-Made in Czech Republic

Package contents
-1× piston head with fitted guide and sealing O-ring (16×1 and 19×2.5)
-1x guide and 1x sealing O-ring for cylinders with a larger inner diameter (18x1 and 19x2.65)
-1× thrust bearing
-1× threaded bearing flange for piston head mounting screw
-2x strength screw (M3x16 with cross and torx head)

Low weight, high resistance

When designing the construction of the plastic piston head, we set two criteria - low weight and high durability. Precisely because of the weight, quite unusually during assembly, the screw is inserted from the front of the head, the thread is then not in the head itself, but in the flange of the axial bearing of the spring. Otherwise, the thread would have to be directly in the plastic, which is not a good solution for repeated assembly and disassembly of the piston head. Or there would have to be a threaded duralumin insert in the head, but that would increase its weight. We therefore chose the most optimal solution.


Sophisticated geometry of the back pressure system

The piston head is so-called counter-pressure, which is already an established standard today, but we still managed to move the proven design a little further.

EPeS piston head has 11 suction holes for O-ring sealing. The placement of these holes has been chosen to maximize flat contact surfaces with the impact rubber of the head while maintaining excellent compression. The larger the functional area of ​​the impact rubber, the more efficiently the shocks of the piston are absorbed, the weapon exhibits a quieter operation, and the life of the rubber is also extended.

The edges of the intake holes are rounded in the EPeS airsoft piston head to an ideal aerodynamic shape for effective air access to the sealing O-ring. But even more important is the disruption of the sharp transition between the straight face of the head and the hole. This sharp transition is in most cases the cause of damage to the impact rubber of the cylinder head.