It's been awhile since I shot at the GCL but the last time I shot rifle there I got a warning for "rapid fire" shooting and then excused off the range when myself and two friends that were visiting me from Ft. Bragg argued with the guy about what realistically defines rapid fire shooting. It left a bad taste in my mouth.
That said I have taken both the basic and advanced NRA pistol courses there and enjoyed both, the advanced course had some cool scenarios like shooting while moving and shooting from cover, not too in depth but a nice change from shooting modified weaver all day.
