I bought a Nate Chronograph to check my tune on my .25 DRS Tactical. The chronograph had sensor issues so I messed up my tune. I received the replacement chronograph and tried to tune my ar but t couldn’t get above 630fps with regulator screw screwed out as far out as possible and hammer spring to max. I degassed and bottomed out regulator screw plus one full turn. The fps increased when the regulator screw was turned in and reached 925fps bottomed out with max hammer spring. The regulator adjustment is opposite of what I would expect, am I looking at a bad oring on the regulator valve?
FX DRS Tactical Tuning Issue
- Thread starter Bigbaby
- Start date
No. Max pressure and max spring doesn’t equal max fps. You’re overpowering your hammer spring. That’s why your velocity went up when the pressure went down. But at very low pressure you’re just wasting a ton of air by smacking the ever living piss out of your valve pin. Do not think of the tuning system and reg as volume knobs. They absolutely are not. You must balance them. Picture this as a balance scale, you know the old scales of justice type. Every time you raise pressure. The scale tips you’ve placed another coin on the pressure side. So the scale tips on the empty hammer side. You must place an equal coin on the hammer spring side. There’s a learning period and you’re going to have to get familiar with your fx. What are you trying to shoot. A velocity means nothing without a projectile and weight. What barrel length.
Back your hammer to minimum. Drop your reg to 100-110-120 wherever you want. Leave it set. Then load your mag. Take a few shots through the Chronograph. Then start taking up the hammer spring a click on the big wheel at a time. Your velocity will rise and rise. Until you reach a point where it stops and likely starts falling. At that point you’ve reached the max velocity potential for that pressure. You either dial back the big wheel one or two positions and then start moving the micro wheel
Up a click at a time. Until you find a velocity you like and minimize the spread. Or you raise the pressure. Which will again drop your velocity if you’ve done this correctly. Because your reg pressure is overpowering the hammer strike. And you must start working up again.
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common mistake
your hammer+spring can not generate enough power to open or keep the valve open long enough with that high plenum pressure.....less air will get behind the pellet....lower speed
your hammer+spring can not generate enough power to open or keep the valve open long enough with that high plenum pressure.....less air will get behind the pellet....lower speed
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