Drop off and settings
Drop off occurs when the mini reg and expansion chambers cant refill quickly enough to the neccesary pressure to fire the paintball at a consitent velocity, so if you had a string going you would see paint start to fall shorter and shorter.
More than happy to help or advise with any A1/Fly problems...currently have 16 flys to fix so am seeing pretty much every screw up, fault or tampering out there..
Need you to answer a few questions though.
First thing to look at with a Fly or A1 with magno internals is the output of your air system. Is it a high pressure system as generally used for Ego's, etc with an output of around 850 - 900 psi or have you bought a low pressure system 450 - 500 psi system to work with the Angel? Brand of air system would also be helpful.
This makes a Huge difference and is most likely the source of the problem.
You would generally adjust velocoty by adjusting the allen bolt on the mini reg at the front, very rarely should you need to do anything else. If the marker has been fine and then suddenly jumps up in velocity or drops off it normally indicates a problem.
How many cases of paint roughly have you fired through the marker? After approx 5 or 6 cases I would generally advise getting some pressure checks done by someone who really knows Angels or buying yourself a full set of gauges. Reason for this is that once the ram "beds in" you can generally drop the LPR pressure..
I have also been dropping the dwell to 5.5 without any issues once the markers are bedded in.
You want to ask anything specific feel free to either post or pm on here (dont check this place that much) or email ollynorth @ googlemail .com (taking out the spaces) more than happy to help OR drop John at LIPS an email
http://www.lpspaintball.biz/ Johns forgotten more than most "techs" will ever know. Just let him know you been speaking to olly from Delta please.