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Well guys, here she is, all finished and ready for my testing!
Bottom piston is our prototype M28 piston, center one is the stock M28 piston and the top is a Vsr piston..
The rear of the new piston is not aluminum, it is steel. Has a delron ring and its pretty nice!
Here is a video of me testing its compression. I only held the air in the cylinder for 10 seconds and released but I have held it for 20 seconds already and it held perfectly!





Bottom piston is our prototype M28 piston, center one is the stock M28 piston and the top is a Vsr piston..
The rear of the new piston is not aluminum, it is steel. Has a delron ring and its pretty nice!
Here is a video of me testing its compression. I only held the air in the cylinder for 10 seconds and released but I have held it for 20 seconds already and it held perfectly!
