On some weapon types, there is only one underbarrel attachment that reduces first shot recoil, and it is one of the last attachments to be unlocked. The addition of one or two more attachments with the same purpose but a weaker effect would be welcome. I.E. weak version @ 100 kills, medium @ 250 kills, and the strong version (Stabil grip) @ 500 kills.
First shot recoil greatly effects the feel of gunplay, and I think the game might be improved by allowing players to influence this stat earlier in the course of an individual weapon's progression.