Setting rails in place, support pin, drilling holes
After folding the receiver it’s time to add rails, extractor and center pin. A spot welder is the preferred method for attaching the side rails, but you can also use rivets. screws or tack welds to attach the rails. Whichever method you use, be sure to heat treat your new receiver after bending and attaching rails. After hardening your receiver will last for a long time though many shooting sessions.