Our take: The JG Silent Polycarbonate and Aluminum Bore Up Piston Head has a Rubber Bumper to reduce impact noise and is extremely sturdy with durable polymer and aluminum construction. Bore Up Piston Heads are designed specifically for AEG's with barrels longer than 490mm. The Piston Head's design allows it to maximize the volume and compression inside the cylinder. The JG Silent Bore Up Piston Head is a great choice for high powered, high performance AEGs with longer Inner Barrels. The ball bearings help reduce stress on the spring, which is what makes this Bore Up piston head an essential upgrade when installing an upgraded spring. The rubber bumper greatly reduces the impact noise of piston head to cylinder head contact. The JG Silent Bore Up Piston Head also creates a perfect seal inside the AEG cylinder with wide/ soft O-rings, which increases the consistency of the AEG's FPS.
This JG Silent Bore Up Piston Head can only be used in conjunction with a Bore Up Cylinder and Bore Up Cylinder Head.
Disclaimer: Any and all Airsoft upgrade parts purchased from Airsoft Megastore will be used/installed at owner's discretion. Actual performance results depend on quality of installation, Airsoft AEG barrel length, tightness of the air nozzle seal, and other possible performance-affecting factors. We are not responsible for any damage that may occur with improper installation. For best results, please do all upgrades at a certified professional Airsoft technician/shop.