AR-GEAR Model 4/15 .223 5.56 Carbine Short Size Pro Series 6.5" CQB Fixed Skeleton Stock Aluminum Buttstock Precision Machined From 6061-T6 Aluminum For A Lightweight & Rigid Stable Platform Featuring A Soft Closed Cell Padded Foam For A Comfortable And Solid Cheek Weld Fixed Provides For A 6;5" Cleverly Designed To Accept Carbine Springs As Well As Slip On Butt pads To Help Minimize Felt Recoil