Get age verified first. It's really a much better option.
I checked the link...and it doesn't specify what the receiver body material is.
There is however a big freaking red banner with white writing that says,
"*** All Models sold in Canada come standard with high-grade clear plastic receiver ***"
Despite that though...there are a lot of dark tinted receivers out there...and I know Mach1 sells them.
Why don't you PM Shinobii (Emilio) himself...and ask him specifically?
(hint...I can tell you right now that he doesn't import ANYTHING that won't come in legally)