The screws that are included with this mount require a 5/64'' allen wrench for installation. Mounting Hardware is Included

• 6-48 X .313"" Overall Length
• 8-40 X .313"" Overall Length
• 8-40 X .335"" Overall Length

This mount has a bottom radius of .670"". There should be a slight gap at the top of the radius between the receiver and the mount when mounted. The two spreads on this mount measure .500""-.505"" and .8625"" which should fit the receiver ring on the following guns: Common Applications: Shotgun:

• Mossberg 500, 590, 835, 930, 935 Pre '97
• Mossberg 500, 590, 835, 930, 935 Late (after '97) (Requires 8-40 and Longer Screws)
• Benelli Auto / Super Black Eagle / Vinchi, M2 (Will Work in the Front Set Only, 8-40 Screws)
• Benelli Supernova (Will Work in the Front Set Only, 8-40 AND Longer Screws)
• Browning A-Bolt 12 Gauge
• Franchi Affinity
• Savage 210
• Savage 212
• Savage 220
• Stoeger M3000 / Stoeger M3500 (Will Work in the Front Set Only, 8-40 Screws)
• Winchester 1300
• Winchester SXP

Rifle:

• Remington 700, 722, 40x
• Remington 783
• Remington 710/770
• Remington xp 100
• Remington 4, 6, 7400, 7615 (Front Set Only, 8-40 Screws)
• Savage Arms Centerfire Models
• Winchester 70