I learned first hand during basic training why no one wants to shoot full auto. We were issued M16 A1's. And after our first trip to the range drill sergeant asked who wanted to shoot full auto. Myself and one other unknowing recruit volunteered. I guess I must have gone through about 6-7 mags before I had had enough. Wasn't until we got back to the armory that I learned why no one else wanted to shoot. Being new to the M16 I learned those old wore out A1's are a pain in the a$$ to clean when the armorer is anal. The only reason we were allowed to shoot full auto was because they didn't want to check in a partial case of ammo at the armory.