ACD (Anti-CANT Device)The patented ACD (Anti-CANT Device) is a simple spirit scope level mounted in an aircraft-quality, two-piece aluminum scope ring that mounts in minuteswithout special tools. Properly mounted, the ACD allows the shooter to visualize and make adjustments for CANT, which experienced shooters recognize as rotation of a scope's crosshairs off a true vertical/horizontal plane.
Mounting Solutions Plus specializes in tactical mounts and gun accessories for professional and competition shooters.
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Try it, it will help with your accuracy.
God Bless Yall!