The "Rocket Launcher Loader" perk in these gauntlets has no description, it only repeats the title of the perk.
It should say "Increases the reload speed of Rocket Launchers".
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There are actually several armor pieces that do this, though not all of them. It appears to only be with the Rocket Launcher Loader perk. I've seen it on several other legendaries. It's not unique to the Nothing Manacles.