Brownells are now selling their own branded M4 style barrel.
The AR-15/M16/M4 Carbine Barrel (#080-000-681) is made of 4140 chrome moly steel, hardened to Rc 26-33 and stress relieved. It’s 16″ long with a 1 in 7 twist and ½”-28 threads for a flash hider. M4 feed ramps provide reliable feeding into the 5.56 NATO chamber. A dark gray, Parkerized finish helps prevent rust.
They are selling it for $219.99. I wonder how long before they start selling a Brownells branded upper receiver.