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I would just get the upper receiver, barrel, gas tube, front sight base, maybe even the handguard already assembled as one unit. Without a vice, upper block, torque wrench and a specialty wrench or two, building your own upper looks more expensive than buying assembled.
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I agree with this but for different reasons. One of the biggest reasons AR's "KABOOM" is improper head space. If you don't have the gauges to properly headspace the barrel; I highly recommend just buying a barreled upper.