I noticed that my M2 Impact was slowly losing air over time, I sprayed down with Windex and noticed air was slowly coming out of regulaor weep hole on RH side of gun, I removed bottle, removed trigger guard, air vented out of rest of gun when I removed bottle so I knew it was regulator rebuild time. Removed side plate to expose trigger, removed pin from PacMan, pulled trigger group out to gain access to regulator. Unscrewed reg adjust screw then screwed out regulator body, pulled out piston with belville washer stack using Ernest Rowe piston removal tool so I would not damage. Carefully removes belville stack and placed over screw temporarily to keep in correct order. Removed all five regulator O rings and noticed the one on piston was deformed as well as the one inside regulator body. The one on end of regulator body that seals when you screw body into action was also in bad shape. Replaced both small O rings on adjustment screw, I also inspected the O ring down inside acton regulator cavity and that one looked fine. Lubed all O rings sparingly upon assembly with Super lube synthetic grease. Reassembled everything and once again used Ernest Rowe handy reg piston insert tool to install and release piston with belville stack. I inspected piston tip for wear and all looked good. Screwed bottle on and pressurized, backed out adjustment screw and set regulator to 100 BAR, this is where my .25 with 720 Plenum likes it.Checked weep hole again and no more bubbles, filled to 250 BAR and let sit overnight and needle still right at 250 BAR so all good now. Mounted FX Chrony and set velocity back to 935 FPS with 25.4 JSB. very little variation. All good now. I got about three years out of this regulator since last rebuild.
Tuning FX Impact Regulator Rebuild Time
- Thread starter bzizzi373
- Start date
Nice job. I find the regulators the easier part. That blasted O-Ring on the inside of the gun housing is my nemesis (Gen 1 guns). I believe the MKII guns have the same O-Ring. Next, it's time to replace the O-Ring inside the bottle. It's even deeper than the regulator O-Ring.
Good on ya for getting this done. It's a necessary maintenance item but can be daunting to many
Good on ya for getting this done. It's a necessary maintenance item but can be daunting to many
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No more bubbles is a good thing. Great that you were able to get it taken care of. Once you start messing with these guns you find they are not all that complicated.
I had troubles with my MK1, three months after I purchased it, the velocity and poi changed every several hundred rounds. I found that the reg piston had a flat spot on it so I replaced it and sanded the centers of the Belleville washers out to make sure they had no burrs. Over twelve thousand rounds through it now and never another problem.
I guess I should restate that. Never another problem that I did not cause. ;^)
I had troubles with my MK1, three months after I purchased it, the velocity and poi changed every several hundred rounds. I found that the reg piston had a flat spot on it so I replaced it and sanded the centers of the Belleville washers out to make sure they had no burrs. Over twelve thousand rounds through it now and never another problem.
I guess I should restate that. Never another problem that I did not cause. ;^)
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All I can say is, Thank heavens for the FX Master Class series on YouTube. Saved my bacon more than once. Thanks FX and Earnest!
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Can You guys tell, after how many shots the AMP reg needs rebuild? I have a Dreamline (.177, high power), bottle version. I've shot probably 2000-2500 shots, but now the speeds are very inconsistent. Last string was 23 shots with extreme spread of 40fps. For example, if I start the string then first 4 shots will be with ES about 2-4 fps and then the 5th shot is like 20-25fps lower. Couple of shots on that lower speed and then jumps up to higher speed. Like every couple of shots changes speed for about 20 or so fps. Smells like reg rebuild?
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