Adjustable blocks on AR-15's are more common with supressor, but usually not necessary otherwise. You can usually tune the system with different weight bolts, buffers, and springs.
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Originally Posted by Powderman
Also--if you have a front sight/gas block that is pinned in place, you're going to have a devil of a time getting it off. Those pins are swaged in under tremendous pressure.
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Actually, it's very easy.