16-inch AR-15 barrel chambered in 5.56 NATO with a government / M4 contour and a 1:7 twist. The gas system is mid-length, which gives a smoother impulse than a carbine-length setup on a 16-inch barrel.

Features:

• 16-inch length
• 5.56 NATO chamber (also accepts .223 Remington)
• Government / M4 contour
• 1:7 twist
• Mid-length gas system

This barrel uses a mid-length gas system, so plan on a mid-length gas tube and a compatible handguard for your build.