Mostly looks. Certain face and body types it will provide a better cheek weld. It also puts your cheek in a straight line orientation with the sights on stocks that have cast and toe in or out. Ones like a Whelen cheek piece with a concave sort of saddle configuration do seem to help with consistent cheek placement. A cheek piece and a wider comb can help prevent getting a bruised cheek with a heavy recoiling rifle.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
| 
