NFM character using guns mounted to their body

[Varyon]

I'd probably have it be a new specialty of Guns. The details of aiming might result in two (possibly more) specialties of Guns, however. Is it a truly fixed mount, such that the character has to aim by shifting their body? Or is it something that can track their head movement (possibly meaning it's actually mounted to the head; this might only be an option for low-powered firearms, like pistols and maybe SMG's/PCC's) to shoot at what they are looking at? Those seem like they'd be two different specialties - Guns (Fixed) and Guns (Gaze), with the latter possibly sharing a default with Innate Attack (Gaze) (much as I've suggested in the past a Guns (Wrist) sharing a default with Innate Attack (Projectile)).

At lower TL's (probably up through TL 8 or so), Aiming would require some sort of drop-down sights. If we imagine the weapon simply as a more traditional one mounted upside down, you'd just install a riser of appropriate size to get the actual sights - iron, reflex, scope, whatever - down to eye level (note this means the weapon needs to be long enough for the barrel to project out in front of your face; a back-mounted pistol you aren't going to be able to use the sights for unless you've got some sort of extender that does project out far enough). For Guns (Gaze), at lower TL's you'd probably be restricted to head-mounted if you want to get full Acc out of the weapon, as the sights aren't going to line up when your head is turned (you'll get full Acc - and be able to use the scope - only when you are positioned as though it were a fixed mount). HUD links would avoid this drawback, so for TL 9+, Guns (Gaze) may be the way to go. I'm not sure if a back-mounted weapon would have reduced ST requirements or increased ones, honestly, although I suspect those that track your head movement would have higher ST requirements (recoil would be harder to deal with when firing off-center).