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Lapping a receiver ensures a perfectly square and true surface for the barrel to mate against thus enhancing accuracy. AR-15 Upper receiver/barrel alignment is critical to accuracy. Also honing the surface can produce optimal positioning of barrel nut so ideal torque can be achieved along with proper gas tube hole alignment.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov.
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