X-Force Vol. 3: Not Forgotten
Craig Kyle & Chris Yost (Writers); Mike Choi & Sonia Oback, Clayton Crain (Artists)
And old X-Men foe, the robot Bastion, has assembled a team of bigots whose hatred of mutants rivals his own. Using these assembled mutant-haters as his pawns, he has begun to put his malicious plans into action. Weaponinzing the Legacy Virus - a scourge that once nearly wiped out all of mutantkind - Bastion has begun infecting mutants, causing them to self-destruct, causing mortal damage to all those around them.
X-Force (3rd series) #12-13, #17-20
Issues #14-16, not collected here, can be found in the collected edition of the X-Force/Cable - Messiah War crossover.