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Beiruty wrote:Get a SIG556 and you got a gtg piston AR, or wait for the new ARX100.
I got a standard SIG M400 and I did not shoot it yet.

Do you know of any pros (MIL or Contractor, not LE) running the 556?

Just curious what you're basing the good to go recommendation you offer.

Pistons are great. The LMT, LWRC, and HK are all gtg.

They provide a high level of utility to folks shooting lots of full auto, or suppressed rounds, or operating in less than ideal conditions. I had one because I thought the technology was neat. That said it was heavy, and though it was used for work, the cost-benefit wasn't there for me.

They do run very clean and stay cool much better than their DI counterparts. You would have to decide if the extra coin and ounces are worth it.