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Just a piggyback question on your thread, if i may?
I would like to put together an AR15 also, using the USM4 lower (for the crest and support of SF Assoc). I just want a reliable gun. I am not concerned as much with precision long range accuracy.
What is the most cost effective prebuilt upper (no sights, optics or carry handle-just upper with barrel, charging handle, bolt carrier group and rails)?
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