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AR a2 to a3 upper swap

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Hello members. I have a bushmaster xm15 rifle with the a2 upper and a 20 inch barrel. I want to swap it over to an a3 flattop upper. My question is will I have to headspace the chamber to do the swap or can I just unscrew the barrel and reinstall .... thanks all.

Same barrel/barrel extension and same bolt you should have no problem.

 

Pm sent

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Old school.....thanks bro yeah all the guts are the same.

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