One would need to differentiate between open-bolt and closed-bolt firearms for if you can chamber-load the firearm, since one cant really with open-bolt designs… Of course, if the ability to chamberload a firearm is tied into a items quality or an integral mod or something, it would be rather less difficult to get working…
Speaking of, there are conversion kits to set SKSes up to use box magazines, which would also be handy to have ingame, since giving NPCs automatics is a wonderful way to get killed, the new gunshops have a fair chunk of 7.62x39 potential. Or, yaknow, just being able to setup that rare AKM you found with some sorta semi-automatic limiter, or a new option fer NPCs fer fire mode…
-edit-
I just realized I necroed this, for which I apologize. I blame Discourse, which Im still getting used to and which suggests threads that where locked in 2015, along with things like this.