I like the Riot Guns used by the CSA (pg.401). Is there any more information on these (like encumbrance, rarity, cost, etc.)? Barring that is there anything similar, or a way to create something along those lines without resorting to house rules?

(It's a smallish blaster rifle that has autofire and a stun setting, but reduced damage and range compared to the Big Guns).

I would just use the blaster carbine's encumbrance of 3 and its hardpoints of 4. I would at least put it at 6 or 7 rarity. The other heavy ranged with auto fire are around there. Price wise I would set it somewhere between the carbine (850cr) and the heavy blaster rifle (1500cr). Maybe 1000 to 1200.Not sure if i would make it restricted since the heavy blaster rifle has auto fire and its not.

I agree somewhat with Bronski, I'd lower the HP to 3 due to its autofire capabilities and make it Restricted. Rarity of 6 is a good suggestion, so is the price suggestion.