Last year I sold a few Transformer pieces on ebay. I recently came across these pieces and not sure if they belong to a Transformer. The gun is just over 2" and the missiles are just over an inch.
They could be Diaclone Blitzwing weapons, but can't tell from this picture if they are legit or not. This color has been faked too, so the way to tell is comparing the finish to a legit purple gun and missiles.