I inherited a Mossberg 590 from one of our investigators when he left the department. He had glued a shell hold on the side and it come off. This left a mess. I tried WD-40 and other solvents with no luck. Finally, I used a heat gun on low. I warmed the glue enough of roll it off the gun.
I have a Speed feed on my personal 870 and haven't had a problem with the recoil.
Life's too short to carry an ugly gun.