From a previous posted comment, "FWIW, they're in the current CDNN catalog, in the "closeout" section.
600.00"
The original poster is referring to a "PMax" #4971, see attached pic.
The CDNN catalog item, below, seems to be a different model from a Secret Service special order. So it's not the same gun. The CDNN gun would still not have the Surefire light, mag extension, and has a different stock.
CDNN, "#REM870 POLICE
12 GAUGE18” BARREL
GHOSTRINGSIGHTSYSTEM
4RDSPEEDFEEDSTOCK
3” MAGNUMCHAMBER
PUMPACTION•RECOILPAD
5+1 SHOT•PARKERIZED
SECRET
SERVICE
OVERRUNWITH "