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Keep your rifle level shot after shot for the repeatability you need for consistent accuracy with the Rail-Mounted ACD Bubble Level from US Optics. This level is an anti-cant device (ACD) that keeps your rifle in the same position after every shot; which is essential for accuracy during repetitive shots. To keep it safe during firing, it swivels forward and locks into place. The bubble level is made from 6061-T6 aluminum with a matte-black Type III hard anodized finish that is scratch and corrosion-resistant. Its screw-on cover protects the glass vial from damage during transportation, and during shooting the cover threads onto the opposite side of the rail to keep it from being lost. The level quickly and easily mounts to all Picatinny rails.