UTG Pro AR15 Ops Ready S4 Mil-spec Stock Only FDE. 28 Length 4 Pos. Adjustable Minimal Profile Ergonomic Cheek Rest & Rubberized Butt Pad Features Ambi. Sling Swivel Housing & Sling Loop Includes Removable 5.51"Extended Cheek Rest Insert Matte Black Stock Only Specifications for UTG Pro AR15 Ops Ready S4 Mil-spec Stock: Manufacturer: UTG Pro Gun Model: AR-15 Gun Type: Rifle Condition: New Hand: Ambidextrous Buffer Tube Size: Mil-Spec Fabric/Material: Polymer Package Contents: UTG Pro AR15 Ops Ready S4 Mil-spec Stock What firearm models does the manufacturer say UTG Pro AR15 Ops Ready S4 Mil-spec Stock is compatible with? The manufacturer says that UTG Pro AR15 Ops Ready S4 Mil-spec Stock is compatible with AR-15UTG Pro RBUS4DMS: UTG PRO AR15 Ops Ready S4 Mil-spec Stock Only Flat Dark Earth