The Spikes Tactical SLPK101 Lower Parts Kit is designed for multi-caliber AR-platform builds and includes high-quality components that exceed military specifications. This kit features a rounded hammer compatible with all calibers, ensuring a reliable fit and finish.Key FeaturesRounded Hammer: Works with all calibers.Included Components: Contains hammer, trigger, disconnector, safety selector, magazine catch, and more.Finish: Black oxide stainless steel for enhanced durability.Aluminum Trigger Guard: Comes with spring-loaded detent and roll pin.Made in the USA: Assembled with American craftsmanship.