Notes

Frontier Justice: gain 2 crits for each kill you got with your sentry, and 1 for every assist. (lost on death) No random crits.
Widow maker: use metal for ammo, (5 metal per shot) Gives you 1 metal for each point of damage you deal. Reloads on hit
Pomson 6000: On hit, take away 10% of uber, and 20% of cloak if you hit a medic or spy. Divide damage by 5 for attacking some buildings.
Rescue ranger: Use 50 metal to Retreat a building from afar to a new spot, Shoot one of your team's buildings with the rescue ranger to heal that building 4 to 1 metal to hp ratio when repairing things. Mark yourself for death when you haul anything.
Panic Attack, Do +2 AT up close, and -2 AT from afar.

Luger Morph +4 AT
CAPPER + 4 AT - 2 DF
Wrangler: Triple your sentry's hp and double its firing speed, but it is way less accurate and gets way less healing.
Short Circuit: Launch a projectile ball for 32 metal, its deletes all enemy projectiles. No random crits, Normal shot costs 3 ammo, -4 AT

Gunslinger: +25 hp, Replaces sentry with a mini sentry. If you attack 3 times in a row, it is a crit, No random crits
Southern hospitality: on hit, make enemy bleed for 2 turns. -1 D to Fire. No random crits
The Jag: Build/level up things 1 turn faster, Heal 15 sentry hp less. -2 AT
Eureka Effect: Takes 1 more action to do something with buildings. Can teleport to either spawn or their teleporter exit (but you have to do a 1 action taunt first) Teleporters cost 50 metal to upgrade and 25 metal to build.