Kaw Valley Precision Solid Stainless Steel Heavy Buffer, 7.5 oz, Small, KVP-7.5

"Kaw Valley Precision Solid Stainless Steel Heavy Buffer, 7.5 oz, Small, KVP-7.5. 40 S&W .45 ACP and 10mm are a blast to shoot but can be tough on AR-15's internal components. Without a properly tuned blowback system you run the risk of being overly destructive on internal lower parts.