The TM-10 lower receiver is designed to fit the .308 Winchester or 7.62x51 NATO round. This is the full weight version of the AR-15. This lower receiver is compatible with DPMS platform upper receivers and is made from 7075-T6 aluminum. We take extra care when machining these and it results in a nice fit and finish. Note: These are considered a firearm and are required by federal law to be shipped to an Federal Firearm License (FFL) holder near you. If you require help finding an FFL holder please do not hesitate to contact us.