Product DescriptionThe FMK AR1 Extreme lower receiver is a lightweight, American-made foundation for AR-15 platform builds. Manufactured in the USA from high impact composite polymer, this multi-caliber lower is engineered for superior strength, excellent durability, and reduced overall build weight. Weighing just 4.3 ounces, it is well suited for shooters building a lightweight rifle without giving up compatibility with standard components. The AR1 Extreme accepts standard Mil-Spec uppers up to .50 Beowulf and is compatible with most current AR-15 lower parts kits, grips, and stocks. Finished in black, this receiver offers a modern look and dependable performance for custom rifle projects.Product Highlights Constructed from high impact composite polymer for a strong, lightweight AR-15 lower receiver solution. Multi-caliber design accepts standard Mil-Spec uppers up to .50 Beowulf for broad build compatibility. Extremely lightweight at only 4.3 oz, making it ideal for lightweight rifle builds and custom configurations. Compatible with most current AR-15 lower parts kits, grips, and stocks for flexible setup options. 100% American made with a durable black finish for dependable long-term use. Specs Product Type: Lower Receiver Platform: AR-15 Caliber: Multi-Caliber Material: High Impact Composite Polymer Finish: Black Weight: 4.3 oz Trigger: None Compatibility: Standard Mil-Spec uppers up to .50 Beowulf; most current AR-15 lower parts kits, grips, and stocks Country of Manufacture: USA UPC: 850979004338 Manufacturer Part Number: FMKGAR1E Brand: FMK Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.