CM16 Raider, upgrading piston spring

Discussion in 'Gun Building, Modifications & Repairs' started by JSP1969, Mar 19, 2012.

  1. JSP1969

    JSP1969 New Member

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    Need fps increase on G&G CM16 Raider Long shooting @ 315fps

    I recently got into Airsoft and bought my first rifle, a G&G Combat Machines CM16 Raider Long. According to the Evike website this particular rifle is rated at 340 to 400fps. Mine clocks in at approx. 315fps. Apparently the shorter barrel CQB has a higher fps but if anything that means the CQB should be closer to 400fps while my Long version should be shooting around 340fps.

    The Raider apparently comes with an M100 spring so I figured if M100 = 100% and 315fps, then M110 = 110% & 345fps. This would be an ideal muzzle velocity for my indoor range (Tac City in South El Monte) which has a maximum limit of 350fps.

    However, am I making a newbie mistake? Would an upgrade to an M110 spring not actually give me a 10% increase in fps over an M100 spring?

    If not, being a Newbie, what are some relatively easy & inexpensive ways I can tweak my CM16 to increase its FPS.

    I read the Sticky Thread about achieving 100% Air Seal in the gearbox.
    http://www.airsoftsociety.com/forums/f10/achieving-100-air-seal-your-gear-box-19877/
    Would this be a good place to start?

    Thank you,
    John.
     
    Last edited: Mar 20, 2012
  2. JSP1969

    JSP1969 New Member

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    Because I have the CM16 Raider Long, apparently the motor has to work harder to push the bb's down the longer barrel which accounts for the reduced muzzle velocity. So in addition to an M110 spring I probably want a better motor, too. I'm less concerned with increasing with rate-of-fire than I am with getting my fps up closer to 350 so I'm assuming I want a torque motor rather than a speed motor, yes? If I do get a more powerful motor though, will I need to upgrade any other parts? Please advise.

    Thank you,
    John.
     

  3. echo1 vmg-74

    echo1 vmg-74 Active Member

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    Richmond
    I'm surprised your G&G has such a low velocity, In my experience all G&G's come with m110 springs. You may already have a M110 in there. You could possibly have poor compression which in turn gives low low FPS. So if somehow you don't have a M110, you should be fine with your stock motor if you decide to get a m110.

    I'd go into the GB and do some of the DIY mods mentioned in the link you posted.
     
  4. WyckedMunky

    WyckedMunky New Member

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    Lancaster
    The Combat Machines don't come with 110s, and the springs break in relatively quickly as well. The blowback ones also have some pretty poor compression, like Mr. VMG-74 said. Do your compression fixes first (especially the piston head o-ring on the CM-16; it is terrible) and it should bump you up to just about the 340-350 range.
     
  5. echo1 vmg-74

    echo1 vmg-74 Active Member

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    Richmond
    Oh, ok thanks for that info.
     
  6. JSP1969

    JSP1969 New Member

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    Thank you for the suggestions.

    With this being my first rifle I don't want to pour a ton of money into it (yet ;), so if I can plug up any leaks and get more air behind the bb, that's probably my first, best, and cheapest place to start.
     
  7. weaps

    weaps New Member

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    Brunswick
    I own several and with minor compression seal tricks, got them to 350fps with the stock motor. Seal cylinder/cylinder head and also seal hop-up bucking onto the barrel and in the hop-up/barrel assembly. I use clear silicon caulk for sealing. I like to seal the barrel as well into the hop-up assembly to keep it from ever so slightly turning when cleaning its bore.
     
  8. alex

    alex New Member

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    Atlanta
    300 fps for CQB is fine. mine chrono'd at 260fps using the field's equipment and bbs and everyone one i shot called their hits.
    if i remember correctly, m100 = 100 meters (per second) = 328 fps, m110 = 110 mps = 360 fps
     
  9. FallenSoul

    FallenSoul New Member

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    Denville
    That's odd that the FPS is so low. I have two of them, and out of the box (with .2 BBs) they were chronoed at 369-385 FPS. In order to use them indoors, I actually had to cut off a coil in the spring (Mine DID come with the m110 spring). What motor is in yours? Cause I have the Ver 2, which may account for the differences.