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John, Bushmaster's web site states this upper comes with a bolt carrier group, and one 4 round magazine. It should be ready to go when you receive it. Some have reported better results by switching out the standard buffer and spring, to a Spikes T-2 buffer and and a JP tuned and polished spring. You can always call Buds to confirm the complete bolt carrier group does come with the upper. contact Bud's directly at 1-859-368-0371 (9am-9pm EST Mon-Fri) or use the "chat now" button located at the bottom right hand portion of your screen, (9am-9pm EST 7 days a week). Never hurts to be sure.
John, yes Sir. You just need a lower to "Rock -n- Roll".
