Mine, up until recently, was my Remington 541X as noted in a previous post. However, I picked up an M&P 15-22 mostly for the kids (I thought) and when I was sighting in the red dot I put on it, kind of got hooked. That thing's a blast! And with a little massaging, the trigger is pretty good now too. I also have a Springfield Scout M6 that's a lot of fun too, although the trigger sucks on it.