Want some more G1 style armourments to go with the new Powermaster Prime, well here they are!
This is a Ginrai/Godbomber style shoulder cannon that attaches to one of two included shoulder mounts.
Clip the shoulder mounts from the spru atop the cannon and they should slide nicely into the gaps left on Primes shoulders.
The cannon can be held by Prime or any figures with 5mm peg holes and can combine with the 'True Guns' to make a HUGE gun or for storage in vehicle mode.