It's a good time to be a custom bolt fan...
New action from Bighorn the Origin and another one from Gunwerks GRB finally offering custom actions at sub-$1k prices ($850).
New action from ARC the nucleus $1000
ARC released a quick barrel change system called "barloc" $150
Curtis Vector action is coming... won't be cheap ($1400), but it has an amazing feature list and is the first true quick barrel change custom action I'm aware of