I would not do the inside of the receiver or the magazine tube and slide. Tolerances are small and you would be inviting the potential for a sticky or difficult to work action.
-- Edited by nhcrowshooter on Sunday 24th of June 2012 10:22:13 AM
-- Edited by JasonSelmes on Monday 3rd of March 2014 12:38:53 AM
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I conur with NHCrowshooter. Matte finishes, which tend to have some thickness, are for exterior surfaces only, surfaces that do not interface with other metal.
If the crows are close enough to see the shiny inside surfaces of your receiver, shoot them with your pistol!
I have an 870 and I applied paint to the receiver of the gun because the finish on the newer 870's leave something to be desired in terms of rust prevention. I did not apply any product to the inside of the receiver. While I would not suggest or see a reason to apply product to the inner receiver of an 870 I do not think it would cause any major problems on anything other than the slide arm "trenches". You would not want anything in there gumming up the works. The ejector you spoke of does not come out without some gunsmithing, they are made to be permanently attached. To get the forearm and receiver out you first need to take out the trigger mechanism. Then, you can slide out the forearm/slide rails/receiver. To get these items to slide out you have to push on the spring loaded bar that keeps the shells in the magazine during cycling. Getting the receiver back in is a little more difficult because you need to push a lever on both slides while sliding the parts back in. But, if I can do it anyone can.
Again, I do not see a reason to nor would suggest applying anything to the inside of the receiver.