18" brownells grendel barrel review

[JDub]

Any idea who makes these barrels? The stampings look very similar to the ARstoner I purchased from midway. Mine is a six groove and came in a triangular box with blue webbing. I'm not sure if it's a liberty or not but it is not 5R and its stampings don't look like the other liberty AR stoner barrels posted on this forum. It also doesn't engrave any markings on chambered factory amaxes.