Maxim Defense Industries CQB Buffer/Spring Combination H1 4oz Weight Tungsten Features: Maxim Defense Industries is offering a line of custom buffers and springs which are designed to pair perfectly with this CQB stock systems. The custom spring and buffer weights will allow you to tune your firearm for specific loads and brass ejection patterns getting the most out of your platform. Maxim Defense Industries CQB Buffer/Spring Combination H1 4oz Weight Tungsten Specifications: Maxim Defense MXM-47565 CQB Buffer/Spring Combination H1 Buffer Weight 4oz Tungsten/Stainless Steel Natural Finish Fits: Maxim s CQB Stock