On my S&W M&P 15-22, 5.56 AR, and M930SPX, I use Aimpoint Micros (R-1) ... Absolutely amazingly awesome.
Cannot stress enough how lucky I am to have them and how they quickly sold me on their value- They are rock solid tough and they have such battery life- on setting 8 of 12 it's like 5 years, on setting 12 of 12 (The MAXIMUM, and you'd only need o use that on an incredibly bright sunny day facing the sun into your shooting) it'll burn for a full year. It drops right onto the factory rail on the M930SPX, for the AR's I use a Daniel Defense 'tall' mount offering a lower 1/3 cowitness. Maybe I should have tried a QD type mount with thay Arms-throwlever style but when I got the R-1's, the internet entire mofo internet sold out of all Micro mounts for Aimpoint, I was lucky to get one DD Tall mount at the time, and it's what I went with and was like $69 not $100-$200 like others.
Now as far as scopes, I admit I don't use this on my 15-22 BUT I do use them on my other two .22LRs, a Remington 597 and a Savage Mark II. This is the Nikon ProStaff 4-12x40mm scope, I have a "Nikoplex" reticle (fine duplex, aka standard old crosshairs) and a "BDC" Reticle (Bullet Drop Compensating_ ...
These scopes are AMAZING. Redonkulous light transmission.brightness and clarity. I keep these on 4x and they're just GREAT, and of course, don't forget you can dial it up to 12 lol. Both were about $200 scopes I got for $160ish and I am happy happy with them. The quality is there and I feel the value is there, which are two huge important issues to me. Now also, with the BDC reticle- if I had only KNOWN about Nikon's caliber ballitics program, Spot On! You have to see this to believe it- you load it up, and select your stuff.
i.e., add in y our scope choice (For me, a ProStaff 4-12x40mm BDC), your round, lets say this case im using CCI Mini Mags, and then choose the 40 gr RN or 36gr JHP, and ok good.
Now the data- Im in an indoor range at the 25 yd line, but I want a 100 yd zero. Lets do some calculations. It will show me how to shoot at the 25 yd line, and if I am shooting the 40 gr mini mag round noses, be 1.51 inches high at 25 yds for a 100 yd zero, PLUS., then I have 107, 124, 139, and 162 yd zeroed bullet drop dots .. put them on my target for BOOM. Its amazing, worth the 160 bucks for a ProStaff anyday!!!! HIGHLY RECOMMENDED SCOPE.