ORIGINAL: A5Mag12
And any index fund is a far better investment than A-5's. I have over a dozen of them spanning 90 years of production and they all get shot, and yes they are worth a pile but shooting forever is what they were built for.
I collect and trade them too. They have thier shortcomings like any gun. Like splitting the forarms. Lifetime gun? Not sure about that. I have owned a few that were much needed of repair.
It sounds like your not much of a shooter, so it would probably last a little boy like you for a lifetime.