WHAT DOES COLT 20 INCH CLASSIC UPPER MEAN?

Bore Issue: The bore is vibrant, the rifling is sharp. There isn't a erosion while in the bore. The feed ramps are easy and glossy. With this writer’s opinion the bore rates 9/ten.Upgrading or purchasing a new AR-fifteen? Then the 20 inch AR15 complete upper is essential-have that provides improved accuracy and versatility throughout numerous dis