You want the Arsenal and he wants your Polytech; nothing unreasonable there. But don't get cheated in the process.
Make the trade, but he has to give you at least $400.00 to boot. More would be better, but it all depends on how good of a friend this is, and how good of a deal you want to give him. With that, it starts to resemble a fair trade.
Otherwise, sell the Polytech for going price (which I've seen as high as 2k) and just buy yourself an Arsenal, a case of ammo, and a dozen top quality magazines; and still have enough money to take the wife out for a GOOD dinner and a movie.
If you're still in a trading mood, I'll offer you a better trade. I have a brand new SGL-20 stil in the box with one magazine, and a brand new Aimpoint CompM3, also still in the box, with quick detach mount, and Weaver AK sidemount that I'll trade for your Chinese under-folder. Now there's an Arsenal WITH a $450 scope and $150 mount. That's much closer to a fair trade.