Criterion barrel - Criterion Barrels AR15 Barrels, Chrome-lined

It's a very accurate barrel and I do like it. But I'm a cheap guy when it comes to what I shoot at the range and these type of Barrels have very small gas ports with this one measuring in at .066. It absolutely hates steel case and low power 223 ammunition and will not cycle even with light buffer spring and buffer. When running suppressed it does a lot better but it is still under gassed with the type of ammunition I'm running. If you are going to buy this Barrel make sure you are going to shoot nothing but 5.56 out of it or you may run into cycling issues