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Benelli M4 NFA - Is this normal?


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Dear forum members,


one of my two M4 Shotguns is showing significant abrasions on the barrel where the pistons are moving. (see pictures below). Furthermore piston protruding about 7mm out of the tube as compared to to other one.

Both guns have a round count of about 400, mostly slugs.

Production date is 2003, 14" version, 2 barrel port holes.

Both guns differ in the design in that area, is somebody aware of a major technical change during the years?


Thank you for your help,






- hkgermany


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  • 4 weeks later...

My M4 sbs does not have that wear. I don't have that many rounds through it but there is zero wear.

I would say yours is not normal.


Have you removed the pistons? Are they bent?

Are the cylinders in line with the barrel or angled?

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Contact Benelli customer service. It shouldn't be doing that.


Around 2004 Benelli changed the barrel design to add an enlarged shroud around the base of the barrel. This shroud gave a larger seating surface for the barrel/receiver fit. This change occurred between the 11703 release and the 11707.

Edited by StrangerDanger
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