There are so many 9mm AR-style platforms on the market right now, but many of them are using buffer systems designed for the more traditional 5.56 NATO chambering. To get the most out of your pistol-caliber platform, you need an operating system that's tuned to run right, and this Strike Industries AR PDW 9mm Buffer is tuned specifically to give you better performance in your pistol-length 9mm operating system. Each Strike Industries AR PDW 9mm Buffer is designed for use with the company's PDW Stock, PDW stabilizing brace and other pistol-length receiver extensions found on most 9mm blowback system. The steel buffer housing features two tungsten weights that total 4.6 ounces. There's a buffer pad on the housing made from durable NBR rubber, which helps to absorb the impact of the blowback system. You'll also get a flat-wire buffer spring that's tuned to work in these pistol-length systems.