The AR-15 Picatinny Rail Brass Catcher mounts to the Picatinny Rail of any AR with its quick detach anodized aluminum clamp and captures the ejected brass during firing. Its 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 prevents brass from being scattered around your shooting area and works great in preventing hot brass from landing on the shooter or spotter. Its convenient zipper at bottom of mesh bag makes emptying simple. It is compatible with most AR-10/LR-308 models as well and is ideal for reloaders, no more lost brass and it never hit the ground. It is made of heat resistant mesh so it will not melt.