The Caldwell® AR-15 Pic Rail Brass Catcher mounts to any Pic Rail 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 and allow brass to enter bag without any disruption to bolt function or cycling. The quick detent locking attachment feature allows for quick installation and removal of the brass catcher; which allows for quick checking or clearing of the rifle chamber. The large 100 round capacity (.223) prevents brass from being scattered around your shooting area and works great in preventing hot brass from landing on the shooter or spotter. Convenient zipper at bottom of mesh bag makes emptying simple.