ErgoAir Fox Bat on RAW HM1000x chassis

I'm mechanically challenged so I don't want to screw up. I can see how the bottom of the group pulls off to access the inside. But how do I pull the grip off to install a new AR grip. The OEM is a toy.
 
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I replaced the OEM grip with a MK Machining vertical grip, fits my medium hand just right. Just needed a longer set screw.
 
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