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Thread: Benelli M4 damage - is this normal wear?

  1. Unhappy Benelli M4 damage - is this normal wear?

    Dear Forum members,
    When comparing my two M4s, the short barreled versions (from 2003, 2port barrels, I checked it) displays some significant wear in the piston area, like if the pistons are cutting into the metal on the barrel side. Round count is about 350-400 slugs. Furthermore, both pistons are protruding approx. 5mm out of the piston tube (see pictures) My question: Is this normal? Did anybody else experience similar things? My newer M4 looks a bit different in that area (I think they changed the designs over the years) with no signs of wear.

    I would be great If anybody has experience and help me out with that issue.

    Thanks you in advance.

    -hkgermany
    Attached Images Attached Images

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    I'm also curious about this. I have developed similar wear on a chrome lined barrel I recently purchased.

  3. #3

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    Quote Originally Posted by Copenhagen View Post
    I'm also curious about this. I have developed similar wear on a chrome lined barrel I recently purchased.

    Picture of your barrel/damage?

    Does it have no skirt like the above barrel, or is it a newer one with a skirt?

    They are all chrome lined.
    Last edited by Unobtanium; 07-29-2017 at 08:12 PM.

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    I'll grab some pictures in a bit. No skirt. On an 11721 which came with a skirted barrel. The damage is similar but less advanced than OP's bashing at the piston relief cuts.

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    20170729_205029.jpgHere it is. Oh yea, it's a 2 porter.
    Last edited by Copenhagen; 07-29-2017 at 10:04 PM.

  6. #6

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    Odd. Maybe the ports were a bit large or the relief springs a bit stiff on a certain run?

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    Yea it was making me wonder if I should call Benelli, and/or disassemble and clean the gas plugs.

  8. #8

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    Quote Originally Posted by Copenhagen View Post
    Yea it was making me wonder if I should call Benelli, and/or disassemble and clean the gas plugs.
    Call benelli, but I dunno about how the replacement will stack up.

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    I could see both sides, but its definately a problem with their barrel, i.e., me putting that barrel on my 11721 did not, IMHO, cause that damage.

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    Well, Benelli replaced the barrel with another CL Barrel, but this one has the ledge on the rear specifically for the non-M1014 models (it takes up the space under the handgaurds). The barrel the replaced it with was "used," but it looked like it was at most a new blem, as it had a ding close to the crown, but all factory parkerizing was impecable (even in the ding), and the bore/pistons looked as though they had only been test fired. They said that the barrel I had with the damage was a very old model.

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