RareFirearms

https://www.gunsamerica.com/firearms/shotguns/semi-auto/Benelli/M4-NP3-11711-?p=d59102d0-0320-4480-8975-e8ae30d7c883 Very clean 20 shot example is available currently.

Price adjusted to $6k. There is not a single other example for sale. "11711. This is the rare H2O model of the M4. I'm told only 60 of these units made it into public circulation before the ATF cried. This model is the same as the 11707, except it comes with a factory full length steel magazine tube and a factory collapsible stock. All the components were coated by Robar in NP3."

https://gunsamerica.com/firearms/shotguns/semi-auto/Benelli/M4-NP3-11711-?p=d59102d0-0320-4480-8975-e8ae30d7c883 11711 just listed on gunsamerica