I don't build for customers; heck I hardly build. But when I did the gun was proofed and sighted in at 25 yards. No accoutrements. But that was the 70's and 80's. Now if/when I sell the rifle I'm working on I'm inclined to provide a case, wiper (loading rod), worm and ball puller. I see no reason for bags, horns, etc as the customer will have preferences. Every gun needs a case and wipers, worms and ball pullers are somewhat caliber-specific and it's nice to have a set for each rifle, i figure.