So, DMR should have a 15 shot clip, 5 shots to kill, BR should have 36 rounds, 12 rounds to kill, 4 Bursts, and Pistol should be 15 round clip, 5 shots to kill. Flinch is being removed, aim assist being a bit lower than Rifles is fine, but recoil on a Pistol, in a Halo game, shouldn't be a thing.
I think that precision weapons should be able to kill at least three players with optimal use in one clip, including the Pistol. A Pistol 5 shot should also be able to compete with a mid to close range AR, unless the AR lands the majority of its shots, the optimal TTK Pistol should win out the majority of battles.