I need your opinions on this rifle. They are offering a complete rifle with 20 inch barrel. What lenght railed free float handguards can be used on this rifle?

Are there any high-caps you can use with this upper?

I have a Model 1 Sales 20" flattop upper, A2 flash hider, and the $25 FF tube upgrade. With handloads, it is quite accurate. I have yet found a 7.62x39 AR magazine that works "out of the box". MGW: Misfeeds. Generic 20rd: Major surgery and 50/50 reliability. U.S.A. Magazines 10rd: I have one and, with a minor tweak, works perfectly. I have four more of the USA's and they are waiting for me to do the "tweak". Bullet seating depth is critical to proper feeding. (At least in my experience)