I qualify. Don't tell the neighbors. Had Top Secret clearance while on active duty due to my responsibilities in ordering, issuing, transporting and handling ammunitions. Nuthin special, just had enough different kinds of ammo right be hind me most of the time to make a crater out of Berthoud.
Was an armorers asst for 3 mos. HATED the handguards. But I got to carry a 9MM instead of an M-16A2, so I felt like dirty harry instead of GI Joe.
I don't think I remember the difference between th AR-15 and the M-16A2 trigger mechanism to enable me to adapt the AR-15 to semi-auto or even full-auto(M-16A1 style