Just recently trolling the auction sites and found a police department marked 870 in deep blue with an extended magazine. I already own four police shotguns, three in 2 3/4 inch and one in 3 inch. My last one was a receiver without barrel and bad wood, I "rebuilt" it. Now I want a "new" one. It's within my budget and I love old 870's. Do I buy just one more or save the money for ammo?