What do I gain for completing weapon side-missions?

What do I gain for completing weapon side-missions? - Man in  Camouflage Army Uniform Holding Rifle

I have yet to complete any weapon side-mission chain, but I noticed that, after doing five missions for any weapon, the weapon screen pops up showing some runic writings appearing.

Is there any bonus my weapons gain at this point? If so, what is it? What do I gain for completing a whole chain?






Pictures about "What do I gain for completing weapon side-missions?"

What do I gain for completing weapon side-missions? - Silhouette of Two People Holding Revolver Pistols Sitting on Hill
What do I gain for completing weapon side-missions? - Man in  Camouflage Jacket Lying on Green Grass Field
What do I gain for completing weapon side-missions? - Men in White Clothing and Black Hats Holding Rifle





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