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Well, there are different length barrels for different M16 versions.

Often, the rifling is a 1:7 on an M16, which means it makes one rotation every 7 inches. If your barrel has 21 inches of rifling, then it will make 3 complete turns as it leaves the barrel.

You need to count the number of inches rifling you have, then divide by 7. If the rifling isn't 1:7, then you need to find out what it is for a particular rifle.

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