Product Description The Stern Defense Mag-AD .45 ACP adapter converts a standard mil-spec AR-15, M4, or M16 lower assembly to accept .45 ACP M&P magazines. Designed for fast installation, it enhances the AR platform by enabling reliable feeding with compatible M&P .45 ACP mags and includes a last round hold open feature for improved function and handling. Built from aluminum with a black anodized finish, it is a durable solution for .45 ACP AR-pattern builds. Product Highlights Converts mil-spec AR-15/M4/M16 lower assemblies to accept .45 ACP M&P magazines Fast-install Mag-AD adapter design for quick platform conversion Last round hold open feature for improved reliability and usability Aluminum construction with black anodized finish for durability Purpose-built for .45 ACP AR-platform projects using M&P magazine pattern Specs Brand: STERN DEFENSE Manufacturer Part Number: 001SDMAGADMP45ACPM UPC: 850001176002 Type: Magazine adapter Caliber: .45 ACP Compatibility: Standard mil-spec AR-15 / M4 / M16 lower assemblies; accepts .45 ACP M&P magazines Material: Aluminum Finish/Color: Black anodized Weight (listed): 0.5850 lb Approx. package dimensions (listed): 6.8 in (L) x 4.4 in (W) x 3.4 in (H) 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.