Why the marks on bmp is on the small gun ?!

[grave goblet]

??

[broken ibex]

Because they can only afford to paint them once, and, if you put them on the missile, they would be gone forever.

Also because it’s considered the primary weapon.

[torpid echo]

Ya don’t you just love what you earned (with probably a lot of work on your part) you can barely see it even when it’s zoomed in on.