too bad lois will not give you a free part since she works for Centerfire and you bought from Tapco.
Yes there should be a bushing, but since most people replace the FCG with a USA made one anyway.....
I'm curious too.
The AMD is a tight squeeze anyway because most folks want to keep the original grips.
You didn't mention if it's a 63 or 65, but the 65 is even tougher because there are no buttstock or foregip options.