So the finish on my Remington 870 Express was looking pretty gnarly so I went out and picked up some supplies and went to town.
I bought three cans of Krylon camouflage spray paint from Wal-Mart. I bought two cans of olive drab and one of black. (These were the only colors they had.)
I bought two of the green to be on the safe side, but I only ended up using two.
Before I began painting I took some medium strength steel wool and some dawn and scrubbed each metal piece to be painted. They were dried then masked off to keep paint out of the internals.
About 3-4 light coats of green were sprayed onto each piece at about 10-15 minute intervals, then they sat for an hour.
After the hour I masked the parts for the "tiger striping." Sorry I didn't take pictures of that but I took strips of 1" thick 3m painters tape and ripped them in half to get jagged edges and wrapped the barrel and receiver making different patterns.
The places not to be painted black were all covered in tape and then 3 coats of black paint was sprayed.
Tape was removed and the finished product was carefully assembled about two hours later.