• get a M4A1
• display the description of the weappon
• look through the description
• try to find the information about the needed ammo

My settings include the fact that my interface is set to the maximum size possible (big letters).

Maybe it is a problem of the size of the letters, that not the complete description is visible ?

Otherwise the text seems to be not complete.

I found the weappon only once, so I can't say if this issue still exists. But as long as I had the weappon the issue was visible every time I opened the description.