Magpul Industries ACS-L Rifle Stock Lightweight Fits AR-15/M-16 Mil-Spec Flat Dark Earth. These lightweight AR15 Stocks from Magpul Industries are drop-in stock replacements that include storage space in the tail of the stock. Magpul Industries ACS-L Mil-Spec Carbine Stocks have a sloping cheek weld for a slim profile and more comfortable stance along with a rubber butt pad to increase impact protection. Add maneuverability to your to your AR with the Magpul Industries ACS-L Carbine Rifle Stock. Specifications for Magpul Industries ACS-L Mil-Spec Lightweight AR-15/M4 Carbine Stock: Manufacturer: Magpul Industries Gun Model: M4 AR-15 Gun Type: Rifle Weight: 16.5 oz Length: 8 in Condition: New Buffer Tube Size: Mil-Spec Fabric/Material: Polymer Features of Magpul Industries ACS-L Rifle Stock Lightweight Fits AR-15/M-16 Mil-Spec Black MAG378BLK: Mounts on mil-spec sized carbine receiver extension tube not included from manufacturers such as Colt Armalite S&W LMT and others please see the note below Sloping cheek weld provides a wide contact surface for user comfort Storage compartment in tail of stock with positive latching access door on right hand side Supplemental friction lock minimizes accuracy robbing wobble Shielded release latch prevents snagging and accidental operation Premium chrome-silicon lock spring provides positive locking and long service life Replaceable 0.30 in Rubber Butt-Pad offers an anti-slip surface and increases impact protection Compatible with Magpul ASAP ASAP QD and other receiver-mount sling attachments Sling Mounts Mid - Included reversible Sling Mount Kit - TYPE 3 fits up to 1.5 in push-button swivels swivel not included Rear/Bottom - 1.00 in sling loop NOTE: There are two basic sizes of M4 Carbine receiver extensions buffer tubes: mil-spec and commercial-spec. If you have a commercial-spec extension on your rifle make sure to order the Commercial-Spec ACS-L. Package Contents: Magpul Industries ACS-L Lightweight Rifle Stock AR15/M4 55-RSC-MACSLMS What firearm models does the manufacturer say Magpul Industries ACS-L Mil-Spec Lightweight AR-15/M4 Carbine Stock is compatible with? The manufacturer says that Magpul Industries ACS-L Mil-Spec Lightweight AR-15/M4 Carbine Stock is compatible with AR-15 M4Magpul Industries MAG378FDE: ACS-L Rifle Stock Lightweight Fits AR-15/M-16 Mil-Spec Flat Dark Earth