All, I just ordered my 5th AR. The Sig Sauer M400 SRP. I have a LaRue Tactical 18 in., a M&P 15 Sport, a Ruger R15, and a Bushmaster M-4 Patrolman's Carbine. Planning on putting my ACOG on the Sig and mount in my car (in case ISIS or Zombies invade). Have EOTECH and 3x Magnifier on the M&P. Distance scopes on the Ruger and LaRue and a SightMark Red Dot on the Bushy. Anyone have experience with the SIG AR's? What are your thoughts? 1 in 7 twist. Worthy of the ACOG?