Back about 12 years ago a father killed his son while lowering the hammer on his 30-30 lever 94. Yes he should not have had the barrel pointed at his son to begin with but adults do have a problem with hammers some times. My brother loaned a model 94 to our sisters 17 year old boy friend. He also lost control of the hammer while lowering it thank fully he had been pointing The barrel in a safe directions. Neighbor lady had loaded her 94 in the kitchen lost control of the hammer and the round when thru the bed room up stairs where 2 of her kids slept. I am sure that there are many more incidents of lose hammer control hurting, killing and just missing people I don't know about.
I do not recommend lever guns for kids my self.
Congrats on the new single shot rifle.

Al