The Energon Pub

Being a citizen of the UK, where firearms and related equipment are largely off limits I find myself a little stuck as to getting hold of what I need to complete a costume.

I'm looking for something like this:

Some may find this funny but I also need something that will fit Henkei Megatron with the scope removed. The thing is I need two of them to clip to a belt, and they need to be drawable from the left and right hand respectively. Anybody that can point me to a particular product that would satisfy these conditions would have my gratitude.