The AR-15 Pic Rail Brass Catcher from Caldwell mounts to the Pic Rail of any AR with its quick detach anodized aluminum clamp and captures the ejected brass during firing. The clamp and wire frame are fully adjustable to work with a wide variety of rail/optic configurations. Compatible with most AR-10/LR-308 models as well. Allows brass to enter the bag without any disruption to bolt function or cycling. The two-piece system and quick detent locking attachment feature provide quick installation and removal of the brass catch for fast checking or clearing of the rifle chamber. The AR-15 Brass Catcher's large 100-round capacity (.223) prevents brass from being scattered around your shooting area and stops hot brass from landing on the shooter or spotter. Heat-resistant mesh won't melt. Convenient zipper at bottom of mesh bag makes emptying simple.