Try an Ares SCR. It's NY compliant and compatible with all AR uppers so, if you just buy the lower, you can build whatever caliber upper you want (small frame, of course). I built a 6.5 Grendel upper with a pinned and permanently attached thread protector and it's proven nice and handy, and a tack driver, too.
Just like an AR, you can pop the two takedown pins and the rifle breaks down into two pieces.