[philly0001]

Thanks for your reply. I thought you were going to say that. Do you recommend a certain manufacturer or type of piston head. Should I also get a new cylinder? I understand changing these will affect preformance, which is fine but I am not out to improve things (If so then good but not a requirement, I will buy a new upper gearbox-d soon for that), just looking to get this gun up and running again. Besides improved seals therefore preformance is there any other advantage to a ported piston head? Also what sort of preformance downgrade would be expected if I used the piston head with the screw cover drilled out? Could I put anything in the covers place that wont ruin the gearbox? Thanks again for your help HK. I have heard good things about your doctor skills.