Gents, I have a state of the art upper in 300 AAC BLK. It has a 16.25 inch, stainless steel bull barrel with a huge muzzle brake on it. It has 1:8 twist and a full length rail with a free floated hand guard. Does anyone have any experience with this brand? Are they accurate? When I purchased the upper its only markings were SA which I thought was stag arms. I feel kind of dumb for that but any info is greatly appreciated.