Outerimpact Howa 1500/Weatherby Vanguard SHORT Action Picatinny Scope Base 20 MOA This is for SHORT action receivers. Please consult graphic with hole spacing measurements to determine if your receiver is a SHORT action. MOA: 20 - Material: Billet 6061-T6 aluminum. Finish: Matte Black Coating: Type III hard coat anodized 68 Rockwell. Mounting Hardware: Four (4) 6-48 Weaver T-10 Torx Head screws (included). Additional Tools: T-10 Torx driver (not included).