Most AR-15 rifles in the caliber feature 1:7 or 1:8 twist barrels. This is a common thing as these twist rates are suitable for anything from 16” down to 8” or so. The interesting part of the MCX is that is uses an even faster 1:6 twist. This choice comes from the evolving idea that short-midlength barrels need a faster rate than was previously thought.

SIG SAUER MCX Virtus – .300 Blackout Ammunition & Rifles Part Two

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