The Noveske N4 Gen 1 lower receiver is manufactured from forged 7075-T6 aluminum. A Hard Coat Type III Anodized finish insures a durable and lasting product. Compatible with all Mil-Spec AR-15 parts, the N4 Gen 1 lower is precision machined and finished by hand. To ensure a snug fit between the upper and lower receiver, a polymer tipped tension screw is included.