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You are right, it wasn't for the rail space.
I keep experimenting with the weapons I buy/build. For this one I wanted the rail to extend over and protect a low-profile gas block. It seems to work well and I still have BUIS, just had to buy one sized right to fit on the rail.
I can mount optics to the top of the rail and not have to worry about dropping zero. I can also grab further forward on the rail without burning my hands on the gas block, which comes in handy when I am trying to shoot very quickly.
I think a regular front sight/gas-block is probably still the best general solution for a weapon that will be kicked around on a daily basis, but I like my setup for a home defense/etc. rifle.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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