Do you already have the barrel, etc?
If light weight and low recoil are the objective, the BCM 14.5 ELW middy with their perm gunfighter muzzle device is the answer. It is BOTH my fastest shooting/shootable and lightest AR at the same time (H buffer)
Adjustable gas blocks do not offer fine tuning. There's really only one setting that both reduces gas and still cycles... one click down and the gun won't run good, and number of clicks open, and there's no gas reduction.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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