Crosman TR77 NPS Mod from 495fps to 1100fps

Here i am showing a few steps in how I modded my Crosman TR77 from 495FPS to 1100FPS. I plugged the Bleed hole in my piston With JB Weld & a Toothpick. I compressed the Nitro piston back into the shaft with a Quick grip Clamp instead of a Spring Compressor