The lower receiver on an Ar-15 is an important piece, but not a critical piece of the accuracy equation. It is important for a lower to be machined to the military specification so that we know parts will fit, and interface correctly. It is also important that the lower receiver is strong enough to handle the type of accessories, and parts that we may be adding. Aside from those considerations, take your pick of lower receiver. Dozens of companies offer Mil-Spec receivers ranging in price. There are also billet options available, but can sometimes affect the function of certain parts.

This build will be using a Mil-Spec lower from Palmetto State Armory. Palmetto State Armory (PSA for short) is known for its budget minded parts, and in this case, the quality of the lower was great for the price. It is a standard 7075 forged Mil-Spec lower, Hardcoat anodized, and even has a threaded hole for a receiver tensioning set screw to remove any receiver fit wobble. The upper and lower receivers, along with the handguard were them sent out for cerakote in the Flat Dark Earth color. Next up will be small parts including the trigger.
de lower