I've decided to get an 22 lr conversion upper for my AR-15. I practice with my 22 bolt action regularly for precision practice, but I have been having so much fun with the AR-15 I bought last year I want to practice cheapish with it (as long as my ammo holds out, anyway.) I almost ordered the CMMG bolt conversion, but read there were accuracy issues, and I wanted to use my Sparrow 22 instead of the 762-SDN-6 I usually have on it for obvious reasons. I am looking for a flat top AR upper that feels AR-15y and not 22 lr-ish. It needs to reliably shoot subsonics with my Sparrow suppressor. I looked at the M&P 15-22 and it was okay I guess, but for $500 I was thinking there was a better upper I could put on and it would feel more like my AR than a different rifle, trigger. Any recommendations? I see a bunch out there, some better reviewed than others, but don't touch on reliability with suppressor and subsonic rounds. It's usually high velocity rounds that are used, and that's a bad thing since I practice in my back yard. Thanks in advance.