I had the M&P15. I really liked it. I sold it and bought the Ruger SR22. I would not be afraid to buy another 15-22. I have heard good things on the Sig, but have never had one. If you like, I will let you know when I take my SR22 to H&H next time. I put a new sight on it, so it needs to be sighted in. I would be happy to let you put some rounds through it.