To any contemplating learning the AR15 before entering the military... a word of caution
civilian drills are completely different and in my mind in some cases completely unsafe.
this is not a fault of the civilians but merely a difference in how the rifles are employed.
ie according to the CFSC handbook on cease fire you should
1. put the weapon on safe
2. unload the weapon
3. place the weapon down
if you do #2 on the range on the order cease fire your staff will not be impressed due to the fact that some of the weapons we use are open bolt style meaning that if there was a round in the chamber that the extractor did not eject, half cocking and your hand slipping due to sweat, numbness, mud rain, etc there is the potential for it to fire.
my point is, you will learn different habits that what the military will teach you. It is easier to learn the ones the military wants you to learn while under pressure and lean the civy ones later at your leasure, than to learn the civy ones at your leasure, then unlearn and relearn while under pressure.
When you are being taught weapons, you will be taught as a class, meaning you will be going at the speed of the slowest and least experianced member.
Also weapons classes are run like simons says
the instructor will first explain the step, demonstrate the step, then get you to do the step
ie
"the first step in removing the bolt carrier is to push the take down pin to the left, like this"
demonstrates
"do this now"
if you touch your weapon before "do this now" you'll be in the stinky brown stuff. Thinking you already know the material will make you impatient and less likely to concentrate on what your instructor is teaching you.