Are you using an AK-Builder flat? If not, "Stop" and go get one... Slip in front trunnion and use old 5/32 drill bits to hold it in place while you figure out where your rails will be spot welded in. Make sure you heat treat the ejector tip prior to instalation. Spot weld the rails in, pull the front trunnion and drill your holes in the receiver through the now installed lower rails before you heat treat. After holes are drilled Heat Treat Axis Pin Holes with your MAAP, and then Install the Center Support Rivet. The rails installed during heat treat give the receiver strength, helps prevent "Hourglassing" of the receiver. The AK-Builder Center Supports are Pre-Heat Treatd, so this is why I install it post receiver being Heat Treated. Process after this is builders choice, but I pretty much build up the receiver from front to back after it is preparred. Front Trunnion, Triger Guard, Rear Trunnion, Press in & Headspace Barrel..... Good luck with your mission, if you should choose to accept it....