[inthetallgrass]

I don't know too much about either of these guns but I know with Tanaka you are guaranteed quality. It's generally the same with G&G but I don't have experience with their sniper rifles. Also I believe some one here used a HPA kit and 12g canisters with a Tanaka m700. GO back a few pages in the gallery and you might find it.

EDIT: scratch that last part, I was mixing it up with another gun. IT probably is do-able though as anything is possible.