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Thread: Daytonagun M249 PSI\FPS question

  1. #1

    Default Daytonagun M249 PSI\FPS question

    I have a DG M249 (A&K) and i have i question regarding fps. I connect my gun to my air rig (HPA) and the gun shoot at about 330fps at 100psi. I still have around 350fps at 160psi. I use o.20gr bb's and a 6.01mm inner barrel. I try 2 different HPA tank 3000 psi (both full) on 2 different chrono (X-cortech). But the fps dont want to go up what ever the psi are.

    I test both chrono with other gun to be sure they work well so the problem are not the chrono. I also connect my air rig to my pistol (KJW G23) and i was only able to shoot around 205-215fps (using .20gr bb's) what ever the psi were at 100 or 160.

    Is there anyone who know why ?

    Thank's

  2. #2

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    Sounds like you reg has some issues, try dis-assembling, cleaning, lubing, and resealing everything on your reg.

    Outside of that adjustable FPS based on PSI is not something I think many of Escort engines have, sure a 50fps variance is possible but I don't think I've ever heard of much more than that (could be wrong). You might need a High-rate spring or something to boost your FPS from DTG.

  3. #3

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    1st question - What is your rig setup? Do you have the Palmers then a subreg, or just the Palmers?

    2nd question - Have you checked to make sure your hop rubber is flush with the nozzle-end of the chamber? If the barrel/hop rubber assembly isn't properly positioned, then the chamber won't seal properly resulting in poor muzzle velocity.

    Keep in mind that with the DG/Escort systems, the input pressure has very little to do with muzzle velocity. You can vary it slightly, but ultimately the volume of air in the expansion chamber will rule the day. You reach a breakpoint where the chamber WILL open and release the air down the airshaft/barrel regardless of what the input pressure is. That's just the nature of the system. Can't fight physics (unless you're Einstein or equivalent.)
    Shakman
    Whiskey Company

  4. #4

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    Quote Originally Posted by frogfish View Post
    Sounds like you reg has some issues, try dis-assembling, cleaning, lubing, and resealing everything on your reg.

    Outside of that adjustable FPS based on PSI is not something I think many of Escort engines have, sure a 50fps variance is possible but I don't think I've ever heard of much more than that (could be wrong). You might need a High-rate spring or something to boost your FPS from DTG.
    Thank's for the answer. I'll clean and lub my reg and try again. I contact DG for info about a new spring.

    Quote Originally Posted by airsoftshak View Post
    1st question - What is your rig setup? Do you have the Palmers then a subreg, or just the Palmers?

    2nd question - Have you checked to make sure your hop rubber is flush with the nozzle-end of the chamber? If the barrel/hop rubber assembly isn't properly positioned, then the chamber won't seal properly resulting in poor muzzle velocity.

    Keep in mind that with the DG/Escort systems, the input pressure has very little to do with muzzle velocity. You can vary it slightly, but ultimately the volume of air in the expansion chamber will rule the day. You reach a breakpoint where the chamber WILL open and release the air down the airshaft/barrel regardless of what the input pressure is. That's just the nature of the system. Can't fight physics (unless you're Einstein or equivalent.)
    1er I only have a Palmer regulator no sub reg.

    2e My hop-up rubber is OK but i'll double cheek it to be sure.

    So on DG system if PSI as not that much do do with FPS what could i do to upgrade FPS ? I already install a 6.01mm inner barrel.

    Thank's

  5. #5

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    Just for fun, try .25g at 160psi and see what happens.
    http://electric-bugaloo.mybrute.com

    bah weep graaagnah wheep ni ni bong

    "Ladies and gentlemen, take my advice, pull down your pants and slide on the ice" Sidney Freedman

  6. #6

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    Longer barrel, stiffer/longer spring or a heavier bolt should do the trick.
    Some Escort-type designs (not this one, though) also use a two-part airshaft. In this case, a stiffer spring in front of the forward airshaft-nozzle will also help.

    I did some experimenting with my MG3, adding a stiffer nozzle-spring and a spacer for the recoil spring. At 140 PSI I got 450-460fps with .2g BB's
    At that same pressure, I got 520fps with .3g, so heavier BB's definitely help!

  7. #7

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    Thank's everyone for these fast answer. I'll do some test this week-end hopefully it will solve my problem.

    Thank's again

  8. #8

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    Are you seeing any hopup effect? If you turn the hopup up considerably, does your velocity go up? After firing a single shot, can you tip the gun over and a BB roles out? When cocking the gun, can a BB roll out the end of the barrel? Answers to these question will really pin down possibilities.
    http://electric-bugaloo.mybrute.com

    bah weep graaagnah wheep ni ni bong

    "Ladies and gentlemen, take my advice, pull down your pants and slide on the ice" Sidney Freedman

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