Are there any upgrades for WST Megatron? I've noticed that there is an add-on kit for the MP05 Megatron, but is there a similar kit for WST Megatron? Parts I'm looking for would be the barrel extension piece, or silencer, and the arm grip thingy. Sorry for my bad terminology, I don't know the official name of the piece that attaches to the handle of the gun to help steady it. But are they available for WST Megatron? I've just purchased one and would like to upgrade it some time.