I thought GURPS had some specific backblast rules, but all I could find were generic ones for recoilless weapons in GURPS Vehicles.
In GURPS, weapons with a hot gas backblast have a lethat range of (bore in mm.10) yards and do 4d6 fire damage. In T2K terms, damge would probably be 4d10. For weapons that don't use hot gases, a divisor of 50 and damage of 1f6 (or perhaps 1d10) seems more appropriate, although GURPS only addresses hot gas backblast. I'd apply the damage to the firer if he didn't have sufficient room behind him, otherwise only to anyone unlucky enough to get in the way.
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