Greetings!
According to RAW, the only difference between GCS guns and BCS guns is that GCS gives "Reliable" (if they do not possess it already) while BCS simply makes them Never Jam ever.
Now, mathematically, I do not feel that BCS is all that much superior to GCS and that there is no real incentive for players to get a BCS gun over a GCS gun (except for roleplaying purposes or when using plasma weaponry).
So I thought about giving BCS guns the same +1 to damage BCS melee weapons also enjoy, this would mirror the bonuses of Master-crafted weapons in DW.
What do you think?