SAFE
Pull the charging handle to the rear and release. Place the selector on SAFE. Pull the trigger, and the hammer should not fall.
SEMI
Place the selector on SEMI. Pull the trigger and hold to the rear. The hammer should fall. Continue to hold the trigger to the rear, pull the charging handle to the rear, and release it, Release the trigger with a slow, smooth motion until the trigger is fully forward. The hammer should not fall. Pull the trigger. The hammer should fall.
I can't find what I was looking for but I remember also something about bumping the stock with your finger off the trigger and the hammer shouldn't fall.
Also let the bolt slam home on an empty chamber and the hammer shouldn't follow.