PROOF Research PR15 223 Wylde 16" 1:8 Twist Barrel

PROOF Research lists this as a PR15 barrel in 223 Wylde, 16" long with a 1:8 twist and a 5/8-24 muzzle thread. The 223 Wylde chamber is cut to accept both 223 Remington and 5.56 NATO ammunition, which is a large part of why shooters go looking for a barrel like this one.

The 1:8 twist is the general purpose choice for the bore, steady with heavier match bullets while still handling lighter loads. Gas system length, barrel profile and gas block journal diameter are not listed for this barrel, so check those against your upper before ordering.