Shipping Handgun to Springfield...

So I want to ship my 1911 to Springfield Armory to get some new sights and front strap checkering. I have already contacted them about it and they said they still do those services. They don't know I'm in California though.

Is it still possible to ship a handgun to an out of state gunsmith like this? With the holidays I'm pretty positive the turn around time is probably going to run into January so most likely the new laws might spook them about shipping it back. I'll have to ask them about that.

Anyways, I've looked and both UPS and Fedex have strange rules regarding shipping firearms. What's the best way to do this?

Thanks.