The Browning X-Bolt Eclipse is possibly the closest thing you can buy to a custom made rifle off the shelf

The Browning X-bolt eclipse is a new variation on a tried and trusted product with some major improvements. The trigger system is now the super feather trigger that comes in all new X-bolt rifles and makes it much more sensitive and crisp to fire. The rifle comes in .243, .308 & .30-06 and currently only [...]