Originally Posted by
Skeetshooter
I'll add my 2 cents worth,
Shotguns don't have a rear sight, the theory is that you face sitting on the stock in the same place every time, with your eye looking down the rib is your rear sight.
This is what gun fit is all about. As far as stock length goes you don't want it so short that your thumb is against your nose about a 25mm gap between thumb and nose is about right for most people.when you shoulder the gun with your face on the stock you should be looking down the rib,looking slightly down on the rib,ie not flat along the rib.
Pattern board is a good place to start