I just G5'd my Tormentor and extended its magazine (The Magazine Capacity is only +50% not Double, so take that into account for weapons like Executioner and Intimidator, you're only going to get 1 extra shot).
So basically I have a Space DEagle. 9 Shots at 22.6 damage per shot. It's absolutely barbaric. Debating which gun I should upgrade next, but I really like the Karma 50. Until I can confirm whether or not the Accuracy modification will tighten the spread of the Intimidator, I'll probably just go with the AR50.
I was thinking
Magazine Capacity
Longer range
better handling
Headshot damage