A pair of accessories based on the two large guns included with Transformers "G1" Blast Off, but with 5mm posts so that they can attach to Unite Warriors/Prime Wars Trilogy Blast Off (or Fall of Cybertron Blast Off, or most other Transformers).
See
here for a version designed specifically for compatibility with Combiner Wars jet Blast Off, and
here for an updated version of Blast Off's handheld gun.