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This is from the Rem service manual.
a Action bar, free of deformation and moves free.
b Shell latches, front end of latch should have a max of 1/16 engagement over the shell.
c Mag spring and mag follower, free movement and tension.
d Carrier: Should be low enough to allow shell to pass, but not to protrude below loading port of receiver. Look for bent tip, shell guide or burrs on the rail.
I have found the 870 to be easy to work on, repair. You can get a field service manual off flea bay for $7.
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