Erm, yes. They can revolve, so while their operational range isn't extremely wide, they have good uses in situations where I need an element of surprise.

[Here, let him just take out his external helmet and hold it up, tapping the rim of what looks like one of a double set of antennaes.]

I only added these and made the arm gun-mounts after it became undeniably clear I couldn't carry simple hand blasters anymore, unfortunately. [Jetfire shrugs, eyeing his radiation protection helmet, optics slightly dimmed.] Clearly that... er, alternate version of me decided to go much farther in the augmentations for... ah, personal armaments.