When I was shopping around, I was also looking at their 3-gun upper, and was told the below:
Since I will probably be running a suppressor on it at some point, I wanted the straight contour barrel. I also wasn't sure about the proprietary length gas system.Quote:
The primary differences between the 3-gun and the SPR is barrel profile and gas system. The gas system on the 3-gun is 1-inch shorter than rifle length, in addition rather than being a straight contour under the handguard the 3-gun barrel diameter is narrower towards the gas block and heavier towards the shooter.