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As far as I know it should go something like this. It shouldn't be to far off from the disassembly of that of a regular M4.
1.)Remove the the rear body screw
2.) Firmly grip the rear end of the upper receiver and slowly pull the rear end up. You will begin to see the tabs flex as they slide out of the lower receiver.
3.) Once the upper has been opened from the lower it is optional to remove the front pin as you do not require to since you are merely swapping a barrel.
4.) Reach into the front end of the upper receiver and extract your barrel.
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