Uploaded February 2017 | Updated September 2026, 1 week ago

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Help me select the proper upper receiver assembly for my latest AR15 project. This is the start of completing my last AR lower receiver and I have not yet decided what components I will use. Should I build another AR pistol, an AR carbine, a big-bore AR, an AR hunting rifle, or something different. I discuss the 5 options I am looking at but these are far from what can be done with the lego gun we call the AR-15.

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