Product DescriptionThe Angstadt Arms heavy buffer assembly kit is a complete drop-in upgrade designed to help blowback AR-style pistol caliber builds run smoothly. This kit includes an 8 oz solid-state buffer and a carbine buffer spring, making it a reliable option for AR platforms chambered in 9mm, .40 S&W, and .45 ACP.Product Highlights Complete drop-in buffer and spring kit for blowback AR-style firearms Compatible with 9mm, .40 S&W, and .45 ACP builds Heavy 8 oz solid-state buffer helps improve cycling and reduce bolt speed Includes carbine buffer spring for a ready-to-install setup Durable black finish suited for hard-use AR platformsSpecs Brand: Angstadt Arms Manufacturer Part Number: AA45BUFKIT UPC: 853427007134 Platform Compatibility: Blowback AR-style firearms (AR-9 / pistol caliber AR builds) Caliber Compatibility: 9mm, .40 S&W, .45 ACP Buffer Weight: 8 oz Included Components: Solid-state buffer, carbine buffer spring Color/Finish: Black (Matte)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.