CBS Collapsible Butt Stock Upgrade your standard collapsible buttstock with our innovative one. Storage compartment for CR123 batteries. Side Picatinny rail – allows addition of adjustable cheek-rest #ACP or 12ga’ shell holder SSM. Rubber non-slip buttpad with tapered angle, allows faster shouldering and increased comfort with body armor. Two ultrasonically welded metal quick release sling mount points. All can be easily fit to both left/right handed users. Available for mill standard (CBSM) or commercial tube (CBS).