Hi again HNI Visitor,

Like someone else already suggested. Start him with either the .223 Remington or the Marlin Camp 9mm. They will both have less recoil than any of the others....and they are fairly inexpensive as well (but not any cheaper than the 7.62X39).

Once again...good luck!

P.S. HNI Visitor. It sounds as though you may have limited experience with these firearms. If that is the case try to find either a Hunter Safety Instructor, (an NRA Safety Instructor), or at a minimum a local range where there is a qualified Range Master. (If all else fails and an internet search doesn't turn up something near you...try the local law enforcement training facility. Approach them and explain your situation and INSURE you and your grandson are well grounded in the safe handling and operation of these firearms!)