With the AR type rifles, barrel thickness is USUALLY conducive to improved accuracy. I have carbines with very lightweight profile barrels up to rifles with HBar profiles and one bull barrel. Each has it's place. The carbine I carry most has an HBar profile 16". I tolerate the slight addition of weight since it makes the rifle easier to shoot. The thin barrels are nicer to carry but may be slightly lacking in the level of accuracy I require.
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