I've not tried the Amsoil products. For bore cleaning, I use good old Hoppe's 9. To address copper fouling in rifles, Wipeout. As far as oiling or protection of the outer metal (shotguns and rifles), I use G96. I don't recommend that you spray or pour oil into the internals of your shotgun receivers, it'll just turn to muck over time. Take the extra time to strip them down and clean up is all you need.
Should you need extra help, feel free to PM me.
Good luck....
