These classes are not in how to shoot the gun, but in proper care and maintaince.
The 1911 class will show you how to strip your 1911 completely apart... trigger housing group and and all, what parts do what, basic gunsmithing on fitting various parts, and putting it back together.
The AR15 class would be something along the same line. How to completely strip and reassemble, and how the parts interact.
If you have never taken your gun down to that level, these are great classes to attend.