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Ok do you have the o-ring that came with the original piston? If so use that one over the one that comes with the silent piston. Also does your piston have a huge hole in the center of it? If so its missing the silent shaft or grub screw. If it has a white shaft that is how your losing a lot of speed. It plugs up the cylinder head for the last bit of the pistons travel. This creates a pocket of air to slow the piston down and make it "silent". If you have the grub screw thread lock it and replace the white shaft with that. If you don't you can cut the shaft down. Make sure the threads between the cylinder head and cylinder are teflon taped. Once you do this take the trigger/cylinder group. Cock the gun and put your finger over the hole in the cylinder head. If the piston inside doesn't move you have a good seal but if it comes in contact with the front of the cylinder head without you removing your fingers the seal is bad. Try that out and get back to me. Taking apart the hopup unit and teflon taping it is also a good idea.
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