Wheeler receiver lapping tool ar lr/10 - Wheeler Fine Gunsmith Equipment Delta Series Variant Receiver Lapping Tool AR LR/10

I ALREADY OWN THE WHEELER AR/15 LAPPING TOOL. I AM NOW BUILDING SEVERAL AR/10's. BECAUSE THESE COMPANIES ARE TURNING OUT UPPERS LIKE POPCORN, SOME OF THE UPPER RECEIVER BARREL SURFACES ARE AS MUCH AS 0.005+ (THOUSANDTHS) CANTED EITHER LEFT, RIGHT, UP OR DOWN. THIS CAN CAUSE ERRATIC BULLET IMPACT AS THE BARREL AND RECEIVER GET HOT. WHEN YOU START STRETCHING YOUR SHOTS 300 TO 600 YARDS AND BEYOND. I PROVED THIS TO A COUPLE OF SHOOTING FRIENDS, WHO BECAME FRUSTRATED WITH SHOOTING BEYOND 400 YARDS AFTER THE BARRELS WERE HOT. I DISSEMBLED TRUED THE UPPERS AND REASSEMBLED. WE WENT BACK TO THE RANGE MADE NO OPTICS ADJUSTMENTS, 1-GUN SHOT 3" HIGH AT 300yds. THE OTHER SHOT 2 1/4" TO THE RIGHT. AFTER MAKING OPTIC ADJUSTMENTS WE SHOT TILL THE BARRELS WERE HOT AND SHOT PLACEMENT STAYED CONSISTENT. TAKE A LITTLE EXTRA TIME TRUE YOUR UPPER RECEIVER, BECAUSE LONG RANGE SHOOTERS NEED ALL THE HELP WE CAN GET. GOOD GUN CONTROL MEANS HITTING YOUR TARGET!