Have you been wanting to build a 9mm AR? Most firearm enthusiasts do. The available parts from manufacturers has grown alongside the popularity of this AR build. The ODIN Works 9mm Medium Profile 5" 416R Stainless Steel barrel take advantage of the popularity of those 9mm AR Platforms. It comes in the well known 9mm Luger chamber to run inexpensive training ammo, hollow points, and custom loads. The 1:10 twist rate is cut with button type rifling and has the normal *1/2x28 thread pattern to fit most standard AR muzzle devices*. The medium profile of the barrel keeps it rigid and helps with accuracy. Between the Colt magazine or a Glock magazine compatible AR9 lowers, either one will work well for your newest build. 
 
*NOTE: Even though the barrel uses a standard 1/2x28 threads on the muzzle, you must be sure you get an AR muzzle device that is made for a 9mm (or larger) bullet to pass through it. Many muzzle devices are threaded to 1/2x28 but are made for 5.56 or .223. When you measure the hole at the end of the muzzle device, it should have a hole that is larger than .354" (9mm).
 
Specs:
1:10 Twist rate button rifling
416R stainless steel construction
Works with Colt mag lowers or Glock mag lowers
1/2x28 muzzle threads
Medium Profile barrel cut
10.4 ounces