If you can see spending a little more on the barrel, I recommend a Compass Lake Engineering Recon barrel. Although it is not a SPR barrel, it is very similar. Their Recon barrel is 16.1 inches and comes standard with M4 Feed Ramps, MID GAS SYSTEM, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar. It is made using a Douglas blank and comes in 1/7 or 1/8 twist. You can also have it made with a CLE Match or Wylde chamber. They also have three ways it can be finished. I have one of these barrels on a build I did back in 2014. I absolutely love the performance I get from it.
http://www.compasslake.com/index.php...roducts_id=337
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