I've heard favorable reports on the SIG/Sauer 522s, but have never shot one.
I can give you feedback on some alternatives...
I've shot the S&W MP15-22. My son's friend has one. Reliable and reasonably accurate. It will cycle subsonics through Mini-Mags. I didn't care for the all plastic body, but so far they've held up well. You pretty much have to like them as-is. I also am not a big fan of railed forends. Still, it is tempting to get one as a truck gun, since the finish ain't gunna get hurt. I wish the plastic rail was made from aluminum or steel, since clamping rings to it either results in them loosening, or marring it. If I had one I'd install a long riser block and put the rings on it.
The Colt M4 clone in .22 LR is metal, and is closer to the real deal, but suffers from reliability. And that pretty much kills it as something to be recommended.
Ruger makes the most reliable, the SR-22, because it is based on the 10-22. However, it only vaguely resembles an AR15. If proven reliability is high on your list, this is what you should be looking at. Accuracy has also been very good with these.
Remington makes a tactical version of their 597. The less said about it the better.
Myself, I went a different route...
View attachment 210877
This is my CMMG Sierra upper in .22 LR. It basically emulates an M4 flat top. The barrel is a dedicated .22 LR, not a .223. This increases accuracy. The basic mechanism is that of the old Ceiner conversion kit, but this one works and is reliable. It can be installed on any AR15 lower that has a round face hammer (notchless) and a GI trigger. Reliability has been excellent, and accuracy is very good, running just behind my 10-22T. It has cycled anything from CCI and Rem subsonics to Mini-Mags, with or without a suppressors. The upper receiver is a genuine AR15, not plastic like the Chiappa. CMMG offers several versions of this upper, and has several options for each upper, such as operational forward assist, bolt holt opens and stainless steel interior parts. CMMG mags mags for them, but I like the Black Dog mags better. I paid $349 for my upper from Midway, but prices have gone up. I think they're $399 now. And CMMG also offers these as complete rifles, and these rifles will accept .223 uppers. (BTW, that's a suppressor on the end of the barrel. The barrel is 16". The lower is a plain Del-Ton that I swapped its notched hammer for a notchless.)
Eight different CMMG .22 LR uppers
Three different CMMG .22 LR rifles.
I can give you feedback on some alternatives...
I've shot the S&W MP15-22. My son's friend has one. Reliable and reasonably accurate. It will cycle subsonics through Mini-Mags. I didn't care for the all plastic body, but so far they've held up well. You pretty much have to like them as-is. I also am not a big fan of railed forends. Still, it is tempting to get one as a truck gun, since the finish ain't gunna get hurt. I wish the plastic rail was made from aluminum or steel, since clamping rings to it either results in them loosening, or marring it. If I had one I'd install a long riser block and put the rings on it.
The Colt M4 clone in .22 LR is metal, and is closer to the real deal, but suffers from reliability. And that pretty much kills it as something to be recommended.
Ruger makes the most reliable, the SR-22, because it is based on the 10-22. However, it only vaguely resembles an AR15. If proven reliability is high on your list, this is what you should be looking at. Accuracy has also been very good with these.
Remington makes a tactical version of their 597. The less said about it the better.
Myself, I went a different route...
View attachment 210877
This is my CMMG Sierra upper in .22 LR. It basically emulates an M4 flat top. The barrel is a dedicated .22 LR, not a .223. This increases accuracy. The basic mechanism is that of the old Ceiner conversion kit, but this one works and is reliable. It can be installed on any AR15 lower that has a round face hammer (notchless) and a GI trigger. Reliability has been excellent, and accuracy is very good, running just behind my 10-22T. It has cycled anything from CCI and Rem subsonics to Mini-Mags, with or without a suppressors. The upper receiver is a genuine AR15, not plastic like the Chiappa. CMMG offers several versions of this upper, and has several options for each upper, such as operational forward assist, bolt holt opens and stainless steel interior parts. CMMG mags mags for them, but I like the Black Dog mags better. I paid $349 for my upper from Midway, but prices have gone up. I think they're $399 now. And CMMG also offers these as complete rifles, and these rifles will accept .223 uppers. (BTW, that's a suppressor on the end of the barrel. The barrel is 16". The lower is a plain Del-Ton that I swapped its notched hammer for a notchless.)
Eight different CMMG .22 LR uppers
Three different CMMG .22 LR rifles.