I'd have to disagree that the Mossberg 715T is not a good choice if this is going to be the first AR style .22. I have one and it is a lot of fun.
It is not a true AR style, but it is fun to shoot, and is as reliable as you allow it to be.
If you plan to never clean your gun, or to shoot crap ammo, do yourself a favor and get something else.
If you are OK with spending a negligible amount of money to get better .22 LR ammo, and are able to clean your gun every 250 rounds, I would recommend this gun.
For plinking/target shooting, you can easily product sub 1" clusters from 50 yards regularly. This is the absolute cheapest setup that I own and others love to shoot it. I have put ~2500 rounds through it with only a handful of issues. Mainly it is the failure to fully eject with cheap/dirty ammo (Walmart Winchester 22LR 550 pack, Remington Hollow Points/Rim Mag, or Federal Lightning).
Just remember, you are purchasing a 702 Plinkster with a plastic AR look clamshell. Here is mine, works great.