This is a blaster accessory for the Transformers Generations War for Cybertron: Siege Leader/Voyager Class Shockwave figure based on Shockwave's classic laser blaster alternate mode, but with a 5mm peg handle to allow for compatibility with the Siege line's C.O.M.B.A.T. system, and to allow any other figure of your chosing that features 5mm pegs/posts to wield it. The tip of this accessory also features a 3mm peg so both the included effect part as well as the effect parts included with certain figures from the Siege line can peg on and replicate "blaster fire" effects. the included effect part features 3mm port holes on both the front and back ends to allow for further play options.
Note, if you are purchasing this item primarily for the effect part, purchasing in "Smooth Fine Detail Plastic" or "Smoothest fine Detail Plastic" is recommend to best replicate the same "clear effects" seen on the official Siege effect parts included with certain Transformers: War for Cybertron: Siege figures.