hkgermany Posted May 15, 2017 Share Posted May 15, 2017 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 Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted July 29, 2017 Share Posted July 29, 2017 I'm also curious about this. I have developed similar wear on a chrome lined barrel I recently purchased. Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted July 29, 2017 Share Posted July 29, 2017 (edited) 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. Edited July 29, 2017 by Unobtanium Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted July 30, 2017 Share Posted July 30, 2017 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. Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted July 30, 2017 Share Posted July 30, 2017 (edited) Here it is. Oh yea, it's a 2 porter. Edited July 30, 2017 by Copenhagen Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted July 30, 2017 Share Posted July 30, 2017 Odd. Maybe the ports were a bit large or the relief springs a bit stiff on a certain run? Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted July 30, 2017 Share Posted July 30, 2017 Yea it was making me wonder if I should call Benelli, and/or disassemble and clean the gas plugs. Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted July 30, 2017 Share Posted July 30, 2017 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. Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted July 30, 2017 Share Posted July 30, 2017 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. Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted August 30, 2017 Share Posted August 30, 2017 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. Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted August 30, 2017 Share Posted August 30, 2017 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. Correct all around. They owe you proper handguards to fit it, or you can buy some FFT's (not as good as OEM), or some take-offs, or actual OEM's new. Quote Link to comment Share on other sites More sharing options...
Copenhagen Posted August 30, 2017 Share Posted August 30, 2017 Well, it already had the correct hangaurds, I had recently purchased the CL barrel from a member here. Quote Link to comment Share on other sites More sharing options...
Toaster Posted August 30, 2017 Share Posted August 30, 2017 How the FFT compare to OEM? What they lack? Quote Link to comment Share on other sites More sharing options...
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