Weaver Top Mount Base Chart — Find Size
Color:Gloss Black
Size:85
20A
25
401S
402S
403
413
413M
420M
423M
427M
60A
653
67
68
71
76
88
96
97
98
13
16
18
24
35
35M
36
36M
401
402
402M
40A
410
414M
417M
418M
418S
42
45
46M
46S
47M
54
61M
62
63B
80
85
90
93
93A
95
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Choosing a Scope Mount
Choosing a Scope Mount
Choose the Right Base & Ring System
- Match Firearm Specifications: Select bases that match your rifle’s specific make, model, and action length to ensure proper screw hole spacing.
- Select the Mount Type: Choose a two-piece Weaver setup for lightweight hunting builds, a continuous Picatinny rail for long-range rigidity, or a cantilever mount for AR platforms.
- Select Elevation Cant: Use a 0 MOA rail for standard distances, or opt for a 20 MOA rail when shooting long-range targets past 600 yards.
Fit the Mount to Your Optics
- Match Tube Diameter: Ensure ring sizes correspond directly to your scope's main tube, such as 1 in. for standard hunting, 30mm for modern setups, or 34mm for precision glass.
- Select Ring Height: Choose low or medium rings for objectives up to 50mm on bolt-action rifles, and high or extra-high rings for larger lenses or flat-top chassis systems.