The Magpul ACS-L (Adaptable Carbine Stock - Light) is a drop-in replacement buttstock for AR15/M4 carbines using mil-spec sized receiver extension tubes. A streamlined version of the ACS, the ACS-L utilizes the same center storage compartment and cheek weld but removes the battery tubes for a slimmer, lighter weight package.Replaceable 0.30" Rubber Butt-PadCompatible with Magpul ASAP(R), ASAP(R) QD, and other receiver-mount sling attachmentsStorage compartment in stockMagpul Industries Acs-l Stock, Fits AR-15, Mil-spec, BlackModel: ACS-LProduct Type: StockFinish/Color: BlackFit: AR-15Description: Mil-Spec