re: Official AR-15 thread

Boot Camp:
Thumbscrew-put your thumb in the top screw hole on the buttstock
High pocket shoulder- put the buttstock into your shoulder with your thumb still in the screw
grab air- put you arm out leaving the buttstock where it was
high firm pistol grip- get that grip as high as possible

I dont really remember the rest, that was 10 years ago.

I do know the buttstock is definitely high when I shoulder the gun.