Picking the right AR15 pistol lower can be confusing, especially when considering what parts and accessories you need. CMMGhas taken out the guess work with the BANSHEE(TM) Mk4 lower group. Each lower group comes with a suite of innovative parts like our RIPBRACEand line of ZEROED(TM) accessories. Available in seven Cerakote finish options, each Mk4 BANSHEE pistol lower comes with these accessories pre-installed: