There is a pin at the end of the mag tube. Look for the flared end and tap the pin out by tapping on the opposite side (i.e. the unflared end). Use a small bar or pin of some sort to lever the aluminum plug out. Nothing retains the spring so heads up. When you put the spring and plug and pin back make sure you get the orientation right. The plug has to have the hole/threads toward the end of the tube, and the cut-out in the pin must line up with the handguard retaining screw hole in the plug.
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