Don't have a M4 GBB mag, but from the pics it looks like you'd have to load it perpendicularly to the mag from the front (with the adapter on the speed loader) as opposed to top-down like a regular M4 mag?
Edit: here you go, try this... https://youtu.be/3odH7tRRatA?t=87
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My ASC UserID is 666. Oh, great...
Last edited by Phalanix; July 2nd, 2020 at 15:22..
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