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Left it open, well at least one of the guys has closed it with duct tape.
Closing it up properly is beyond my abilities as a welder unfortunately-I know, I should hand in my man card.

I just don't get this, it's so easy to cut a slot and make a proper left handed charging handle for a ruger 10/22.

Hell, without a machine shop I have even made three left hand eject ones for...

Best thing I did after filing the release was drill a hole in the back of the receiver so you can use a cleaning rod properly.
Trigger job helps a lot as well