I recently picked up a
Tactical Solutions AR-22 upper and have been extremely pleased with it. So you can guess what my recommendation is going to be.
I opted to go with the .22 upper mainly because it allows me to practice with a platform nearly identical to my 3-gun rifle for a fraction of the cost. The manual of arms is the same, the way I shoulder the rifle is the same, the magazines fit my AR15 mag carriers, and it points pretty much like my competition rifle.
So far, I've run the upper at one of our local Steel Challenge matches, and it operated flawlessly.
If I wanted to do the same thing with a 10/22, about the only product on the market that fits the bill is the
Nordic Components AR-22 Trainer. I've shot a couple examples of the Nordic product, and it is a uniformly high-quality setup from an excellent company. With this setup, I was able to hit a small flash target about six inches in diameter offhand at 80 yards.
I've shot a couple of examples of the GSG-5 as well, and it's a solid product that runs well and is accurate. On top of that, there is also a very definitive cool factor that comes attached to the GSG-5.
In the last year or so, many companies have started making high-cap plinkers available. Whether this is a result of climbing ammo costs, the current shortage, the rising popularity of Steel Challenge or some other reason is kind of immaterial. There are enough choices out there that if you give some thought to what you specifically want/need in such a rifle, you can probably find something that will fit the bill.