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 four spreads on this mount measure:
.500"-.505"
.600"
.860"
1.4"

Common Applications:

Shotgun:
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
Mossberg 500, 590, 835, 930, 935 Pre '97
Mossberg 500, 590, 835, 930, 935 Late (after '97) (Requires 8-40 and Longer Screws)
Remington 870
Remington 1100
Remington 1187
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