It should hold the components on just fine. The problem is when you go to remove or reposition the grip and seat. Two part epoxy, that is made for rod building, will soften when heat is applied - you'll be able to remove the components if you want to reuse them.

So if you just want a strong permanent bond, the Gorilla glue should work. If you're concerned about the ability to move or remove the parts in the future, stick with the two part epoxy. Hope that helps.

Ron