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Is this essential to the function of the AR or is it an extra that helps it? If you buy a complete upper minus the BCG does it not work? Please assist I'm fairly naive on the subject. Thanks in advance
The bolt carrier group is necessary to function the rifle. It is what cycles the ammunition, locks into the barrel and fires the ammunition. I assume you're asking because you are pricing them and found uppers that don't come with bolt carrier groups. If you buy an upper, you will still need the BCG.