Looking to build a couple of ARs from the ground up. Already have 2 stripped Spikes lowers (Spider and Pirate). For my 1st one, looking at a Spikes Enhanced LPK, either a Spikes or RRA upper, nickel boron BCG and a decent scope. Would like to finish and put a couple hundred rounds in the 1st build before I start the 2nd. Any advice? Thanks to all!!!!!