I have 3 other Core rifles, 2 Scouts and the MOE, but recently purchased the Tac M4 Piston. It's lightweight (rare for a piston) and is extremely accurate out of the box. I added a Burris AR 332 scope and after 5 shots to sight it in, I was consistently hitting the bullseye at 100 yds and I'm just an average shooter.
To me, it feels as though it has less recoil than my other AR's. One thing is for sure, it is a smooth firing AR and performs flawlessly, as have all of my Cores! It's definitely a keeper!! You won't be disappointed!!