There is only one 870 and they only differ by finish and furniture. Every time this topic comes up somone down loads this marketing mess from Remington. No 870 is built with the ISS safety any longer. Every 870 that comes with an tube extension has the same mag tube mounted in the receiver as the P but it is a matte finish not parkerized like the P. The only difference in your 870 Express HD and the P is the finish, furniture and about $30 in small parts. In fact, go to the 870 retail parts list on
www.remington.com and you could build an 870P 4+1 with a synthetic stock for $46 less then you could build an Express 4+1 with the same stock Not that anyone would as they would cost to much). How, to start the 18.5" Parkerized police barrel with bead sight sells for $96 and the 18.5" matter finish Express barrel with bead sight cost $131. The bolts are identical but the Express has the $5 MIM extractor and the P has the $13 solid steel extractor yet both cost the exact same, $93.10. How the heck does that comput. The polymer trigger plate assembly for the Express is $80 and the metal P assembly is $86.90, why, because there are two different springs in the P. I have the polymer in all my 870. It is more durable, stays cleaner inside and if I ding or scratch it I don't have to worry about refinishing it like the metal ones that are painted. I know some other parts buy will keep that to my self. When you buy a new P you are getting a fantasic weapon but you are paying for a word engraved on the reciever and about $30 in parts. Think your P receiver is different? It is not. It is the same receiver as on the Express and Wingmaster. Go to the parts list and you will see the Police receiver cost $239.05, the Express receiver cost $239.05 and the Wingmaster receiver cost $239.05...why do those receivers all cost the same. Because they are the exact same receivers. If you own any 870 then your weapon is as good as the next guys no matter what is engraved on the receiver.