The Spikes Tactical lower receiver parts kit is an excellent choice for completing your next AR15 Modern Sporting Rifle build. Made using the highest quality materials for the utmost in reliability and long service life. Not satisfied with just manufacturing another basic AR15 lower receiver parts kit, Spikes tactical machines to much tighter tolerances and better materials and finishes. Milspec trigger with rounded steel hammer are both black oxide finsihed for long life and smooth trigger pull. Improved ergonomic grip for better control over your firing hand, and more comfort when shooting. The Spikes Tactical lower receiver parts kit for the AR15 family of rifles is proudly made in the USA and is covered under Spikes Lifetime warranty.