Guntec USA AR-15 Complete Lower Parts Kit w/ Ergonomic Polymer Pistol Grip

The Guntec USA AR-15 Complete Lower Parts Kit with Ergonomic Pistol Grip is a US-made, mil-spec LPK that bundles every small component needed to assemble an AR-15 lower receiver and adds an ergonomic polymer pistol grip for improved comfort and control. It is the ideal drop-in package for builders who want a complete, ready-to-install set of lower internals without having to source each spring, detent, and pin separately.

Built around standard mil-spec tolerances, this kit is designed to fit any standard AR-15 pattern lower receiver commonly used in .223 Remington / 5.56 NATO builds. Guntec USA manufactures the kit in the United States to consistent quality standards, making it a popular option for both first-time AR-15 builds and replacement of worn internals on an existing lower.

The included ergonomic polymer pistol grip offers a more contoured, comfortable alternative to the standard A2 grip, giving the shooter a better hand fit during extended shooting sessions. This upgraded grip helps reduce fatigue and provides a more secure hold compared to the basic A2 grip, while the rest of the kit remains fully mil-spec for reliable function in a standard AR-15 lower.