Egw scope base mossberg 100atr la bolt actn 4x4 pcty rail mnt FEATURES:Ambidextrous Finish: Matte Black AnodizingCenter Spread: 4.7" Overall Length: 7.458" Height: .575" (Top of Receiver to Top of Picatinny) Weight: 2 oz. Torque Specs: 20 in/lbs Mounting Hardware: #6-48 X 1/4 Screws and T-10 Bit Included Other Features: Made in usa, mossberg 100 atr long action, bolt action, 4x4 picatinny rail mount