Great Lakes Firearms and Ammunition has come out with their own line of AR-15 barrels that make a great choice either as replacement barrels or for use in new builds. This 16" barrel is made of mil-spec chrome moly vanadium steel, then finished inside and out with a harder than chrome quench-polish-quench nitride treatment. It features a 1:9" twist rate, M4 feed ramps, and has standard 1/2x28 muzzle threads.

Specifications and Features
GLFA 5561619
5.56 NATO (also accepts .223 Remington)
Chrome moly vanadium steel
QPQ nitride finish
1:9" twist
M4 feed ramps
Muzzle threaded 1/2x28
Overall length 16"
Matte black