Does he have his heart set on a .410 or just a shotgun. I have a.410 (not for sale) and I would suggest maybe looking at a 28 gauge or maybe a 20 gauge. I know they have a little more recoil, but they are (first of all) a little more effective for hunting and are somewhat more cost effective for shooting. We all want to shoot a lot when we are first introduced to the sport. The .410 is quite expensive for a box of shells in regards to what you actually get for a payload and knockdown power for clay targets or birds.
If you reload, it's not quite as important, however the .410 is notoriously hard to reload. The other two gauges are decidedly easier and components are easier to locate.
Not trying to talk you out of the purchase, just giving some first hand knowledge. I love my .410 for grouse hunting, but learning to shoot at moving targets is hard enough. It's especially hard with a small calibre shotgun and don't want a youngster to get discouraged.
Oly