The PSA AR-15 complete lower is the best AR lower for most people. It’s a complete lower that’s less expensive than all but the very low end of the spectrum, but it doesn’t skimp on the important buts — being built from 7075-T6 aluminum and Magpul furniture.
Plus, if you like PSA’s products but are on a budget, their blemished offerings will knock their prices down even more in exchange for slight external wear.