A good friend of mine helped me break in my 870P shortly after returning from NRA LEO pistol and shotgun instructor school. He mentioned wishing that he had an 870 for duty. He bemoaned his issue shotgun as a POS. It was a FN police model--not the one with M-16 features but the same Winchester 1300 action. He said the dept. got them instead of Remingtons because they are cheaper.
Forgive if I'm wrong, but I just don't see the point in paying that much for a tarted up Winchester.
There are companies that make AR-15 stock adapters for Remingtons and Mossbergs, but I have yet to figure out the real utility of the mod.
-Chad