This handy gauge allows you to measure the diameter of your barrel to fit our M16/AR-15 Tri-Rail Interface.

This will be a blessing if you have a lot of rifles to outfit and need to easily identify which model Tri-Rail you will need to order. The diameter and Tri-Rail part number are engraved on the gauge. Simply place the gauge over the barrel, just in front of the gas block and read the diameter and coresponding Sidearmor Part Number.

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Price:	$ 19.95

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