Are you not saying, simply popping the two pins and exchanging?
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I am not saying popping the 2 pins and exchanging.
I need someone to remove the barrel from the upper receiver and install it on a new receiver.
Ahh I hoped so...
I can’t help with recommendations but I can tell you it’s as simple as buying a barrel nut wrench. Ensure proper head spacing and torque it down
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Are you mechanically inclined at all? A barrel swap is fairly easy, although done right it take maybe two tools and a headspace gauge that would be good to have anyways.