First, a quick definition of each: MechTech- A weapon that transforms from one form to another. Examples include the DOTM weapons and Concept Camaro Bumblebee's cannon-to-sword weapon. Can be given to other characters HFTD Converting Weapons- Weapons that convert from the main structure (arms, hands) of the Transformer. Are not able to be given to other characters. Examples include Battle Blade Bumblebee's axe and cannon and Battle Blades Optimus' swords. Standrad Handheld- Weapons that, with either the clip system or a simple handheld peg, can be given to the transformer. Able to be given to any transformer, but have no special features.