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Thread: Need less fps

  1. #1
    Join Date
    Jul 2012
    Location
    Chester nh
    Posts
    494

    Need less fps

    Ok hit a snag on my fsr mag. With the red spring I can only get down to about 270ish fps with normal paint this puts Fs rounds at 290-300 and field limit is 270 "stupid whinny kids" . Normally I would drop to the gold spring but that would be to hard on a Fs round that did get spun around. Any other tricks to get the Fps down and still have a gentle lvl 10

    Classic valve with stock on/off
    New reg piston
    Cleaned and oiled
    1100psi input "only tank I got"
    Last edited by Syko89; 09-04-2013 at 03:18 PM.

  2. #2
    Join Date
    Jul 2007
    Location
    New Hampshire
    Posts
    458
    what about cutting a spring to find the sweet spot?

  3. #3
    Join Date
    Jun 2009
    Location
    Kentucky
    Posts
    4,146
    Are you leaking out the back if you go higher then 260?

    If so replace your reg piston.

  4. #4
    Join Date
    Jul 2012
    Location
    Chester nh
    Posts
    494
    Sorry guys I was half in the bag when posted and got it completely backwards. Need less not more. I back it out anymore and it won't fire

  5. #5
    Join Date
    Jan 2002
    Location
    Halifax, N.S., Canada
    Posts
    7,446
    If you have a silver spring, cut it down a bit at a time until the lowest starting velocity is about 250fps. That will give you a nicely operating level 10 at 270fps velocity. Only cut one end. The end against the body needs to be the square uncut end. If you don't a silver spring, you can cut the red one.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  6. #6
    Join Date
    Nov 2001
    Location
    DeWitt, MI
    Posts
    406
    I don't know much about the FS rounds. Do they require a special barrel or bore match? If not, use a heavily ported barrel or overbore as much as possible.

    Or if you have a barrel you don't use, get a bunch of ports drilled in it for use with the FS rounds.

    But, I agree to try the modified spring approach first.
    XT00380
    Last of the Salzburg Clan

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