Originally posted by zizbot123
BUt with extended mags extended mags make it have more damage
That was patched a long time ago, the USAS has the same amount of damage now as it did when the EXT mag glitch was around though.
I'd go for damage and EXT mags or grip as the attachment, although you could change it up depending on the map.
Also you can't really compare range and grip seeing as one is an attachment and the other is a proficiency.