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Thread: PWS FSC556 Recoil Reduction

  1. #11
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    I did, and the mechanical rest was never good enough for an AR because the recoil was so light that there was no significant travel. It should work ok for .308 and larger. What I did in the end was gently hand-hold the AR and shoot 10 shots with and without a muzzle brake. I had an accelerometer on the rifle. All of the small brakes I tested were somewhere in the 30-40% recoil reduction range on an M4.

  2. #12
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    That is a nice rifle. Is the JP block steel? Does the gas set screw ever move on its own? I have one but yet don't have experience with it. I also had an MGI adjustable gas tube but decided the screw was so loose I could never trust it. Also it seemed like a fracture point in the tube. When I called their tech support the guy did not know what class-2 vs class-3 threads meant so I decided they were not qualified to design such a thing and ditched the part.
    Last edited by rsilvers; 05-03-09 at 09:42.

  3. #13
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    Quote Originally Posted by rsilvers View Post
    That is a nice rifle. Is the JP block steel? Does the gas set screw ever move on its own? I have one but yet don't have experience with it. I also had an MGI adjustable gas tube but decided the screw was so loose I could never trust it. Also it seemed like a fracture point in the tube. When I called their tech support the guy did not know what class-2 vs class-3 threads meant so I decided they were not qualified to design such a thing and ditched the part.
    Thanks. Yes it's a stainless steel gas block with 3 set screws (the rear most one is dimpled into the barrel) all three had Rocksett applied to them. I also pinned the gas block using a milling machine to machine a flat and drilled it for a single taper pin and reamed the hole by hand. The adjustment screw doesn't turn on it's own. I used blue loctite on it which sure the heat brakes it down but it makes the screw fit very tight in the gas block. The barrel was a SPR profile but I turned it down to .650" under the rail and sand blasted it. This way is a little more front heavy.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #14
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    Presumably, when you put on that type of gas block, I assume you want to open the barrel gas port hole to larger than normal, right? Then you can turn up the gas to work with weak loads in cold temps.

  5. #15
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    Quote Originally Posted by rsilvers View Post
    Presumably, when you put on that type of gas block, I assume you want to open the barrel gas port hole to larger than normal, right? Then you can turn up the gas to work with weak loads in cold temps.
    You can but I didn't. One weird thing about ultra light carriers is that they actually need more gas to work reliably. This is because the carrier doesn't have as much rearward momentum vs. a standard weight carrier. When I first starting using a light JP carrier (on a midlength with a shaved FSB, non adjustable gas) I would get short stroking, but buffer wasn't running into the end of the receiver extension, then recoil then felt like a BB gun.
    Last edited by Robb Jensen; 05-03-09 at 10:37.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  6. #16
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    Quote Originally Posted by rob_s View Post
    What is the testing mechanism, and what are the units of measure, for determining recoil reduction and/or substantiating claims of same? Is there a separate test for straight-back recoil vs. muzzle climb?

    Robert, I think you had talked elsewhere about building some kind of a jig to test this. Any progress on that?
    http://healthbydon.com/comp1.jpg

    http://healthbydon.com/comp2.jpg

    http://healthbydon.com/comp3.jpg

    http://healthbydon.com/comp4.jpg

    http://healthbydon.com/comp5.jpg

  7. #17
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    Any test also should sound meter. For example, if two brakes both have 40% reduction of recoil, and one one 10dB louder at the ear, then I would want the quieter one.

  8. #18
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    This is an interesting thread.
    If available, it would be interesting to see a table of the recoil redux and decibel reading of the comp/flash-hider vs. an A-2 cage.
    The recoil redux vs. decibel increase is a subjective value judgment, but one that could tip the scales in my decision making.
    Know this primarily focused on M-4, but would also be very interested in other calibers, e.g. .308
    Thanks in advance.
    Last edited by LDM; 05-05-09 at 16:48.

  9. #19
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    Quote Originally Posted by gotm4 View Post
    Many other factors make up the recoil of the rifle.

    Things that effect recoil are:

    the cartridge being fire (some has less recoil than others)
    bolt velocity (things like the length of the gas system and gas volume regulate this)
    weight of the rifle (and more importantly how the rifle is balance)
    the weight of the moving mass (the weight of the BCG and buffer)

    We are assuming everything else is equal and the only control is the muzzle device.

  10. #20
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    Subjective assessment based on what I've fired. (Barrels were either 16" or 14.5") :

    Muzzle rise and noise (decreasing): A1 F/H / A2, Phantom / Vortex, Vltor VC1, FSC556, MSTN Quite Brake.

    Flash (increasing) : Vortex, Phatom, A2, Vltor VC1, FSC556, MSTN Quite Brake, naked barrel (fireball).
    Last edited by akula88; 05-06-09 at 03:12.

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