Frankly, if you're going to run one of these things hard in training and you need 1-to-1 matching with a duty AR (an LEO Special Teamthat uses M4s as their issue weapon, for example), get a conversion unit for your standard AR lower — and, yes, I have a relationship with Tactical Solutions, but feel free to buy Spike's, CMMG's or even Jon Ciener's uppers. You end up with your own stock and trigger, plus a much more rugged gun than any of the dedicated .22 units out there. And yes again, it will cost you more, but TINSTAAFL!!! Especially not in firearms. It's worth noting that departments who do a lot heavy duty Airsoft training have gone away from the consumer products to much more expensive dedicated training guns...I saw a couple of AR Airsofts at SHOT that rivalled "real" ARs in price.
The Nordic Component-equipped 10/22s have had the crap shot out of them in training and in .22 competition by 3-gun champions like Tate Moots. They've held up great and are proven training tools, so I would imagine the SR-22s will follow suit. The Ruger Target 10/22s like the one I have are indeed fiercely accurate, but the hammer-forged heavy barrel is slower moving target to target...so once again, it depends on what one wants to do with the gun (doesn't it always?!?!). If you look at the Steel Challenge rimfire rifle or the Ruger Rimfire Challenge matches, distances are moderate, target-to-target sequencing is critical, and a shorter, lighter barrel and a red dot optic are the proven path for those type matches. In Sportsmen's Team Challenge events, the distances are greater and the targets smaller, so you see heavier barrels and higher power scopes.
You pays yer money, and you takes yer chances...
Michael B