So back when I was about 16 years old (21 years ago) I traded my over-under 20ga for a 1950's Remington 870 12ga Wingmaster. I have shot damn near everything with wings, except geese since this shotgun only accepts 2-3/4".
As time went by I have left it completely stock and untouched. A few years ago I "acquired" a Police 18.5" Rifle barrel... don't ask where it came from. The barrel was almost as old as my 870, so it mated well when it went to a Remington armorers school. I definitely stood out with my cowboy shotgun amongst some crazy custom jobs.
Recently I was given a few extra parts for my 870, and it all started with a pin. I installed the pin and almost immediately after, I was given a +3 tube... of course it was missing a spring and barrel clamp, so back to the interwebz for more parts.
A few upgrades here and there, a few more parts to get the free shipping, then sit and wait.
Of course the heat shroud was not designed for a barrel with sights... so SOME fitting was required.
Needless to say I had too much time on my hands. See what happens when the wife leaves me unattended! On the bright side, she's loaded with 000 Buck and parked as the new house gun.