Usually Ruger sends a customer the OM parts back,, but I would not bet upon it. I would remove the OM parts first,, just as a precaution.
That said,, I fully agree that teaching a young person proper safe handling of all firearms is paramount and will actually serve them the rest of their lives.
Bill Ruger lost his very first lawsuit because a person was unsafe & mis-handled an OM & shot themselves. The judge ruled against Ruger saying; "Bill Ruger knew he had a defective design because he built the safety transfer bar system."
Bill added that crappy "warning billboard" to all the guns after that.
My son,, when he was 2,, I added locks to my gun stuff. But I also NEVER refused to allow him the opportunity to go to the range, and or to handle a gun. I taught him safety. I stressed safety & HOW to handle firearms. At the age of 7, I took him to his first gun show. About 200 tables. It took us most of the day,, because he wanted to handle a LOT of the guns.
BUT,, he had already learned safety.
First,, he'd ask permission to see a gun.
Second, he'd attempt to check the gun to see if it was empty & clear. If he didn't know how,, he'd then ask me how to check it.
Third, he'd point the gun in a manner trying to not point it at anyone.
He was never refused the opportunity to see a gun, and got several compliments on his safe gun handling.
At about 30 years old,, as a LEO,, I was with him & a few other officers. A firearm was handed to me,, and I checked it. Then I handed it to him,, and he checked it again. Another LEO made the comment; "Your Dad just checked the gun. You saw it was empty!" To which he quickly & sternly replied; "He'd kick my a** if I didn't and a solid safety rule is to always check all firearms yourself!"
I was a proud Dad that day.
Then when he & I were on the range with his daughter,, and she was learning to shoot, I stood by & never said a word. He taught his daughter the very same things I had taught him. She was 8 at the time.
An education is something that can never be stolen from you. But it's a crime if you don't share it.
Teach & preach safety.
Teach that there are many different types of firearms.
It'll be a life long lesson.