Check the listing for details. EPeS Airsoft AEG POM Piston Head. Condition: New. Listed at 21.00 USD. EPeS Airsoft AEG POM Piston Head 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. 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. EPeS Airsoft AEG POM Piston Head 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 uséd 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. 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 uséd 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 uséd 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. &times &times &times &times &times &times &times Buy now and save! Shipping info Click the Shipping & Payments tab above the listing description for more info Click the Shipping & Payments tab above the listing description for more info! 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The applicable amount of sales tax charged to an order will be calculated based on the shipment destination's state and local sales tax laws. Thank you for shopping with us on eBay! Returns Returns are accepted Items must be returned within 30 days of the auction ending Buyer will pay for return shipping. eBay integration by