This one is to mount on a 30mm tubed scope.
100% avoids CANT.
30mm Diameter ACD Mount
Spirit Bubble Level.
Easy to Use.
Designed for Real Firearms.
Light & Compact.
Gives the shooter a visual verification that the rifle is dead level before each shot.
Eliminates inconsistent grouping that results from inadvertently canting the gun.
Has a significant effect on group sizes at long range.
Works for both right-and-left-handed shooters.
Good for Long Range Sight Outdoor Activities in the field.