OK guys. I got the replacement.
CTC said the gap is normal on this grip. A Customer Service Supervisor said he has the same gap on his personal gun. He offered to exchange the LG-405 for a LG-305 but could not guarantee that it would be any better.
I think CTC's Customer Service has been friendly and easy to deal with. However, I must say I am disappointed with CTC, overall, because they think this is an acceptable $250 piece of plastic. I don't feel I got what I paid for.
They really need to set their customer's expectations by including 360 degree images of all of their grips on their website so buyers know what to expect.