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