Cobalt Kinetics CK-Pro URG 5.56 NATO 13.7" FDE Upper Receiver Group

A 13.7" barrel with a pinned and welded muzzle device is the classic workaround for a rifle length build that handles like a short one, and it is the reason this length has become so popular. Cobalt Kinetics pairs it with a 13" free float M-LOK rail on the CK-Pro URG in 5.56 NATO, finished in FDE Cerakote over aluminum.

Built configuration includes the barrel, bolt carrier group and charging handle, assembled by Cobalt's gunsmiths, so the only thing left is a lower. On a pistol lower it goes together as it sits; on a rifle lower the muzzle device has to be pinned and welded to make the 16" minimum.