Here is the list of the most affordable yet really important upgrades for your Remington 870 shotgun.
1. Carrier Latch Spring ($4.84)
Carrier elevates the shell and it will be held there until the bolt can push it into the chamber. Carrier dog spring upgrade upgrade ensures positive feeding when using heavier rounds.
Carrier dog spring upgrade is very simple. It is as important as extractor replacement. Many custom Remington 870 shotguns have better carrier dog spring.
You can get heavier carrier dog spring for just $4.84 here: http://tinyurl.com/7yolquh