10-02-2019, 05:12 AM
I have had a lapping tool for a few years and have never used it to lap a receiver. I have used it to check the receivers by inserting it and shining a powerful light to see if I can detect any light. Have never seen any need to use it. I have to qualify my statement. I have only used Precision Firearms uppers and lowers and have found them to be dead nuts so my experience is limited. Am about to order another lower and 3-4 uppers.
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