a lesser grade “synthetic magazine spring retainer” lock down as used on the Express system. The Police shotgun barrel is locked down with a “ball detent” system in conjunction with the magazine cap vs.The Express model utilizes a synthetic trigger housing while the Police models use a compressed metal housing.The Express model has a BEAD BLAST BLUE finish while the Police models utilize either High Luster bluing or Parkerization.** i assume they mean the dimples ? mine has none - like the police model The Express model will not allow for the addition of an extension tube without physical modification to the tube and barrel, which can nullify the warranty.I must have an odd ball here - maybe one of the first off the line or a mis-marked reciever because as i research the police models i find these differences as well : I was under the impression that all Expresses had polymer ones, but perhaps the real early guns had the older-style part. I would be interested to know if that trigger plate is the original part.
