Just like the title says, weapon accessories. This includes both melee and ranged weapons, possibly drones too. Range accessories are your basic standard gun accessories like lasers, grips, holsters, magazines, bayonets, bipods, sights, barrels and scopes. That sort of stuff. Hell, do the starship trooper thing and stick a rotary gatling gun under your gun.
As for melee accessories, maybe tassles or sugatras like the ones in warframes, more basic shapes which could allow for the overhaul of grips and assualters, making them more unique with more accessories?
Suggested by Therex, screw heads so it makes it looks as though you have screwed something together.
This could also go in combination with #287 [Ranged handles and barrels ideas] as well as #373 [Elemental emmiters as accessories] so you create more custom weapons with special effects to make them seem more real.
Feel free to comment your ideas for weapon accessories here. Greatly appreciate if anyone can find better accessories for melee stuff XD.
Attaching some animated but arguably useless stuff like small bells or a compass or a clock,
Making some parts of weapon transparent to show the mechanisms working inside the weapon.
Special gloves etc for weapon when equipped, maybe even different shooting animation depending on the accessories.