I keep winning blueprints from the crates (rifle blueprints, shotgun blueprints, assault blueprints.....) but have no idea where they are going, or how to use them.
Same with weapons parts (rifle parts, assault parts, etc....) I keep winning the packs of "15 shotgun parts" from the crates. Where are they going, and how do I use them?
How do I actually apply these things to the weapons? Playing on an iPhone.