At level 6, a simple archer fighter with 16 str and 20 dex with Deadly Aim, Weapon Focus, Weapon Specialization, Rapid Shot and Manyshot will full-attack with +10/+10/+10/+5 to hit for 1d8 +10 damage.Don't forget about Weapon training, for another +1. And by that level you can assume the fighter has at least a +1 bow, with a +2 bow being somewhat likely.
I actually put those numbers in the calculataion:
+6 (BAB) +5 (DEX) +1 (Weapon Training) +1 (Weapon Focus) +1 (+1 Bow) that puts him at a +14 to hit, however he was also Rapid Shoting and using Deadly Aim, which gives him a -4 to hit, bringing him to +10.
And his stats were 16 str, 20 dex (from 15 base, +2 racial, +1 from 4th level and a +2 belt) [16 str / 15 dex / 13 con / 12 int / 13 wis / 8 cha] was the spread that I used.
And I think this only speaks that the kineticist is a very capable class, since level 6 is when the Fighter Archer gains his power spike (going from making 2 attacks to 4) but the kineticist only gains his at 7th level, when not only he gains an extra dice from empower (at 6 it goes from 3d6 to 4d6, but at level 7 it goes from 4d6 to 6d6) but also can start using Composite Blasts that basically double his damage and also his options to overcome resistances and DR