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RETRO ARMS piston head, Aluminum
It is made of high strength A7075, but the weight of the piston head and O-ring is 6.4g.
Including the thrust bearings and fixing screws, it weighs a hefty 11.8g.
There may seem to be nine intake and exhaust holes, but
The area of the hole that is open as an air passage is about 40% of the diameter of the hole.
The effective area is equivalent to approximately 3.6 Φ2.5mm holes.
![[RETRO ARMS] CNC Aluminum Piston Head](http://rock-et.jp/cdn/shop/files/RETRO-6888_1024x1024.jpg?v=1750401532)
