Well there is a distributor in Calgary who sold me my Pulse R76 for $120 shipped- its the AK-74 shorty that Crosman
supposedly licensed from Tokyo Marui. Shoots 300 fps, has a 375 hi-cap, and near as we can tell is 100% upgradable... but it is plastic and clear and that makes it ugly as sin till it gets painted.
But if you are working the rigs then you've likely got some decent play money

And if you want non plastic you're going to find its a tough go of things so I'd get age verified and drop some of that hard earned coin on a pro gun from Mopic