Few guns represent the American sharpshooter quite like the AR-15. Dependable, adaptable, and highly effective. This is why Thunder Guns is a proud retailer of high quality AR-15 parts, including barrels, bolt carriers, as well as upper and lower receivers. Available in various styles and colors, our AR-15 parts are not just a part of your rifle, they are a part of who you are. Visit Thunder Guns to find a quality AR15 upper receiver and AR15 lower receiver for sale and start building your own rifle.