The Picatinny Rail Gauge is manufactured to be a feeler gauge for measuring the specs of your picatinny bases.
The cutout is made .01" bigger across the top so that you can easily see where the picatinny is tight.
With measurements for center (true picatinny spec), min and max, you can gauge if your picatinny is +2 or -2 thousandths.
Warning: This product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. To prevent exposure, do not alter the product by welding, grinding, etc. For more information, go to www.P65Warnings.ca.gov.
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