FAB Defense GLR16 with a GCP Cheek Riser and GPCP Picatinny Rail Adaptor Black. These AR15 Stocks by FAB Defense fits both MIL-SPEC and commercial aftermarket tubes thanks to its patented anti-rattle mechanism. There are 3 slots for rifle sling attachment on this FAB Defense GLR-16 PCP Tactical Buttstock - one in the front and two in the back. Store batteries and other small accessories in the sealed storage compartment that contains a rubber fixation to eliminate any rattling sounds. Adjust the cheek rest to your liking and enjoy a non-slip design that will improve your accuracy control. Get more out of your rifle by upgrading it with this FAB Defense M4/AR15 Buttstock w/ Cheek Rest. Specifications for FAB Defense GLR16 with a GCP Cheek Riser and GPCP Picatinny Rail Adaptor: Manufacturer: FAB Defense Buffer Tube Size: Commercial or MIL-Spec Length: 180 mm 7.09 in Condition: New Weight: 0.597 lb 271 g Height: 131 mm 5.16 in Width: 2.05 in 52 mm Features of FAB Defense GLR16 w/ GCP Cheek Riser and GPCP Picatinny Rail Adaptor: Non-Slip Unique Traction Design Rubber Butt Pad Allows Fast and Stable Shoulder Positioning Three Integrated Slots for Sling Attachment One in the Front and Two at the Rear Sealed Storage Compartment for Two CR123 or AA Batteries with a Rubber Fixation that Eliminates Rattling Noise Integrated Ambidextrous Quick Detach Swivel Rear Sling Connectors Enhanced Non Slip Quality for Steady Positioning with Body Armor Maintains Contour & Size of Original Design Unique Patented "Anti-Rattle" Mechanism allows fit on Both Tubes; MIL-SPEC and Commercial Aftermarket Adjustable Cheek Rest with Built-In Dual Picatinny Rails Allows Optimal Buttstock Functionality Ideal Mounting Solution for the SH-5 Package Contents: FAB Defense GLR16 with a GCP Cheek Riser and GPCP Picatinny Rail Adaptor FAB Defense fx-glr16pcp: GLR16 with a GCP Cheek Riser and GPCP Picatinny Rail Adaptor Black FX-GLR16PCP