Tiger Rock AR-15 Collapsible Standard Version Stock Body Mil Spec Cerakote Burnt Bronze Medium. The stock is made from extremely tough fiberglass-reinforced injection-molded nylon that stands up well to the elements. with a built-in swivel. Specifications for Tiger Rock AR-15 Collapsible Standard Version Stock Body: Manufacturer: Tiger Rock Gun Model: AR-15 Stock/Brace Material: Plastic Gun Type: Rifle Buffer Tube Size: Mil-Spec Fabric/Material: Plastic Features of Tiger Rock AR-15 Collapsible Standard Version Stock Body M4 MIl-SPEC 6 position buttstock Molded from reinforced plastic composite Fits standard MIL-SPEC 6-Position buffer tubes Metal sling loop/attachment installed Package Contents: Tiger Rock AR-15 Collapsible Standard Version Stock Body What firearm models does the manufacturer say Tiger Rock AR-15 Collapsible Standard Version Stock Body is compatible with? The manufacturer says that Tiger Rock AR-15 Collapsible Standard Version Stock Body is compatible with AR-15Tiger Rock ST003M-BBR: AR-15 Collapsible Standard Version Stock Body Mil Spec Cerakote Burnt Bronze Medium