Originally Posted by Issay Romo
My Valken Proton has this huge leak I cannot fix from where the back scew is inserted within the grip. I had replaced the screw believing it was chipped and didn't allow the air to contain. I now figure it could be the grip frame since it also leaks air throughout the rears sides connected to the reciever. I need help. There is no other site I found after one year selling the parts.
There is an oring that seals air coming up the grip frame and then into the solenoid/bolt system. You may have simply lost or damaged yours. I think it's #26 on the proton diagram in the manual. It can fall off when you remove the grip frame sometimes. Replace it and give it a tiny bit of grease.