I had not thought of that. I’ve heard the sig 556 is very accurate and is gas piston. Have you heard anything about that particular gun?
I was much more into pistols at the time I was introduced to the 556 and, as I had quite a few SIG pistols at the time, naturally it was the rifle that I initially wanted. Production delay after production delay made me start looking elsewhere. The AR platform supports a wide variety of caliber choices from .22LR to .50 Beowulf. Free float the foregrip and put a decent trigger in it and they are surprisingly accurate as their competition numbers demonstrate. Put in some basic maintenance and it's not going to fail. So the AR is what I decided on.
I also switched to a 1911 so my SIG fascination has mostly lapsed although I have 3 SIGs that I simply can't part with.