okay ill start by listing the parts present
http://www.airsoftparts.ca/store2/in...roducts_id=185 g&p m120 gearbox
http://www.airsoftparts.ca/store2/in...roducts_id=771 modify air seal nozzle
http://www.airsoftparts.ca/store2/in...oducts_id=1059 modify ported cylinder
now for the problem. this gun was built from scratch essentially, so the chances of it just working are like.. nil. When i shoot, the bb's fly MAYBE 20 feet and drop like rocks, when i chrono'd it i was running around 250 fps on .28's . I have been told it was probably a compression issue, but im wondering what everyone elses opinion is on it. ( ive also removed the hop up from the question, as i have changed it out for 3 that used to work. )