Are you asking about features, or robustness? If the latter then ...
If you completely disassemble the rings and bases, clean all the hardware with denatured alcohol to remove the oil (even the screw holes), then reassemble with loctite or another anti-vibe compound - I use Vibratite VC3 - torque eveything with an actual torque wrench, then zero and leave it alone; then it should be good until he can afford another one. And while you're at it, vibratite the action screws an torque them too.
I have $40 Simmons 4x32 scope on spring piston air rifle that has well over a 1,000, shots but its got Vibratite on everything, including the ring surfaces. I also have a $120 Nikon on a 30-30 that has over 700 rounds and Vibratite everywhere and it's still rocking. My 308 has a Bushnell Engage thats been Vibratited and it's still solid after 1200 rounds. My friend has a 22-250 and a 308 but does not own Vibratite, purple Loctite, or a torque wrench. He has sent both scopes and one set of rings back, in the last year. Vibratite and a Wheeler torque wrench is cheaper than a scope. Just my experience.
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