Great post, USMC03.
OP- are you getting a secondary upper, or replacing the barrel? If the latter, why? For a better sight picture, why not spend the money instead on a good red dot or variable power scope?
"This is why on a 16" barrel, a mid-length gas system is slightly smoother than a carbine gas system."
I'm glad you mentioned "slightly". Some guys act like if they don't have a midlength gas system with a PWS or Battle Comp muzzle device, the gun will recoil so hard that it will buck out of their hands.
I have an 18" BCM stainless barrel with rifle length gas system. Great barrel, but 16" hammer forged barrels have been my "go to" setup for range day.
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