FMK AR-1 Extreme Polymer AR-15 Lower

The FMK AR-1 Extreme AR-15 lower receiver offers a durable yet lightweight alternative to traditional aluminum lowers. Constructed from high-strength polymer, this lower maintains compatibility with standard AR-15 components while reducing overall weight. Engineered for reliability, it features a reinforced buffer tube area and a mil-spec trigger guard for enhanced durability. The FMK AR-1 Extreme lower is designed for 5.56 NATO/.223 Remington caliber builds and includes a threaded bolt catch pin for easier installation. Its sleek black finish provides a professional look, making it suitable for both tactical and sporting applications. This polymer lower is an ideal choice for builders seeking a lightweight option without sacrificing functionality.