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blaxsun said:
Was it purchased new or used?
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The rifle was bought new, however it was back in October. I couldn't shoot it because at that time I just applied for club membership and then winter... Now probationary period is over so I brought it to the range for the first time this weekend.
 
That seems like a excessive amount of corrosion for such a low round count (<100) and in such a short time (1 day).

If ammo caused this then it's worse than the corrosive surplus stuff!
 
Probably still corrosive primers or something in the ammo, I would call Stoeger Canada (Red Agencies) and ask them what the scoop is... Unfortunately with chinese ammo you're not gonna get any warranty help with anything...

Although it does look like pretty superficial damage... For my Benelli M4 the pistons (when I actually clean them) look pretty much brand new, but 5.56 is much higher pressure than shotshells are, so the high pressure gas could be eroding the steel a small amount, but not at ~100 rounds.
 
Again, the norc stuff isn't corrosive primed.
That's erosion, not corrosion.
My guess considering the very low round count is a piston that didn't get hardened properly by the manufacturer.
Definitally warranty.
 
it is not a metal failure problem. the metal was damaged from an outside influence. don't expect warranty.

it is a no contact/sealing area/ just shoot it and order a spare for when it fails.
 
im leaning towards that maybe it was like that when you purchased it. did you open it up when you bought it? or did you just store it until you shot it? 100 rounds is low to do that type of errosion. my 2.5 cents
 
whitetailbuck said:
im leaning towards that maybe it was like that when you purchased it. did you open it up when you bought it? or did you just store it until you shot it? 100 rounds is low to do that type of errosion. my 2.5 cents
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I think the answer to your question is in post #27...

mamma said:
I will try to go for warranty but I do not recall seeing the erosion before shooting (of course I did take it apart)... Thanks.
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ntm said:
Again, the norc stuff isn't corrosive primed.
That's erosion, not corrosion.
My guess considering the very low round count is a piston that didn't get hardened properly by the manufacturer.Definitally warranty.
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I agree. Clearly gas erosion.

After putting about 6000 rounds through this gun, I can attest to its reliability. Believe it or not, I was somewhat surprised by this because the piston does collect a lot of powder residue and there was a bit of gas erosion on the metal protrusion that splits the gas stream. I had an engineer look at the piece who stated that the splitter would outlive the useful life of the rifle. That was good enough for me, but I prefer things that do not show erosion in my guns. If you have one of these firearms keep an eye on it.

The Argo system also uses a rubber gasket (yes, rubber), to keep the piston tightly aligned with its mount. None of these elements seemed conducive to reliability. However, after a lot of shooting the erosion remained the same and the rubber gasket held up. Not trusting the rubber gasket I eventually removed it to see if the gun would still run. It ran fine, but I have my concerns over why such a gasket is even necessary.
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It sounds like the erosion was noticed fairly early, but never became a problem, even after 6000 rounds. I'd shoot it some more and keep an eye on it. If it gets worse send it in for warranty. If it stays the same, live with it but mention it to benelli, maybe get a spare in case of future failure.
 
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