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What way should a mp5k barrel be pressed to remove it from the gun?
Does it have to be pushed one way or does it not matter?
Is the barrel pinned as well?
Yep, it's pinned. There's a hole that goes through the trunnion and barrel. It's the hole closest to the front of the trunnion, just in front of the mag well.

To remove it, first drive out the pin, then you must support the trunnion and push from the inside. If you are not pushing against the trunnion, you will most likely break the welds that affix the trunnion to the receiver.

I think a 12 ton press will do it, not expensive by any means.
 
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