The current Sound Suppressor (5.56 mm), -(6.5 mm), and -(7.62 mm) all use the exact same model. It suits the 7.62mm weapons fine, because it's quite big, but it looks out of place on the smaller 6.5mm and 5.56mm weapons.
Meanwhile, the Sound Suppressor LMG (6.5mm) is more appropriately sized for 5.56mm and 6.5mm rifles, yet it's only available on two machine guns (The MX SW and Mk200).

I request the current models for the 5.56mm and 6.5mm suppressors be replaced with the LMG suppressor model, and be available in black as well (as tan would look odd on the end of a Katiba)