I just went through the process to have my first custom build done and I went with Snowy Mountain Rifles out of Missoula, MT. They have been great to work with so far and went out of their way to get the parts I wanted to build the rifle I wanted. They stock Defiance actions, Proof Barrels, as well as Benchmark. They also use McMillan stocks on a lot of their builds. I have read some great reviews on them and from what I understand they have a pretty state of the art facility. My build is on a Bat Machine Vampire action, 26” Proof barrel, Manners MCS-T3 elite stock, Trigger Tech Special Trigger, Snowy Mtn. Snowflake Titanium 3 port self timing muzzle brake, and their bottom metal with AI DBM, custom cerakote in gore optifade sub alpine on the stock and all other hard parts cerakote in an accent color, and custom load development with 200 rds. and I believe the rifle will be sent to me in a Pelican hard case with custom foam insert. All together they quoted me $6,300 for everything out the door. I thought that was a very fair price given my parts list isn’t cheap and considering I wanted to use some stuff they don’t normally work with. Give them a shout and ask for Paul, I have no doubt in my mind he will treat you right.