bough this barrel for a retro build but then bought an upper with a barrel so this I'll sell. I will sell for exactly what it cost me...
M16 A1 5.56mm, 1:12 twist Rifle Barrel, 20" 41V50 Vanadium alloy milspec steel, fully machined and assembled with extension, chrome lined bore and chamber for optimum performance and durability, drilled gas port, phosphate finish. 1960s era M16 A1 profile with modern M4 extension (m4 feed ramps), muzzle threading 1/2 x 28, weighs 1.75 lbs. This barrel is phosphate (black in color). Barrel is not pinned for front site.