Quick view Angstadt Arms Angstadt Arms 9mm-40S&W-45ACP Buffer Kit $69.99 The Angstadt Arms 9mm heavy buffer assembly kit is compatible with blowback AR-9 style firearms chambered in 9mm" 40S and W and 45ACP. Includes 8oz solid state buffer and carbine buffer spring... Add to Cart Add to Cart Add to Wish List Add to My Wish List Create New Wish List