I found a NM Upper with some life left in it to get me through this season for $500 on GunBroker. I'm looking at building the lower and am wondering if it is even worth it to build it or if I should just buy an RRA NM Lower. I can build a NM for around $260 using an A1 Buttstock I have already, Spikes stripped lower, RRA NM LPK, and A2 Buffer kit. Is it a good idea for me to build the lower or should I just drop the $350 on an RRA Lower? Thanks.