(Black)
They are magazines for holding and feeding ammo, not Da Vincis!
Understand, but the colored ones to me add a little more personality to the gun. I am not saying I don't stick FDE's in my black AR and blacks in my FDE AR but aesthetically speaking, especially when my stock, grip, trigger guard, BUIS and handguard rails are Magpul FDE, the extra touch of the magazine just makes it look more intentionally.
I built my AR's exactly how I wanted them, barrel length, twists, trigger pull, grip angle, sights, optics, rail length, etc., etc. A matching magazine certainly doesn't help it function better but it looks more intentional.
To each their own... I took a shooting course the other weekend and shot nearly 700 rds with my AR while moving. while the target moved, while standing, prone, kneeling, behind cover, on my back, on my side, with my weak arm and missed center mass of the targets 1x (unless at any point I completely missed the body sized target AND the surrounding target frame). That 1 shot was right in the wrist watch. I would like to think it wasn't the trigger kit, or the barrel twist, or my previous training that did it. I like to think its the fact that the accessories on my gun all match. HAHAHA