This is a Blaster for Sentinal Prime I did not care for the whole headmaster setting in the weapon thing give that I am old school I guess.
This Blaster has a back story..
This was the blaster was Sentinal Primes main weapon in his arsenal when his blaster was damaged in the final battle between him and Megatron in which Megatron won of course, Optimus picked up the blaster after he was give the matrix promising the old friend that this would use this to stop Megatrons rain of terror and had the blaster rebuilt in memory of his predecessor.