For shotguns, it is generally accepted that "The barrel shoots - the stock hits" - but what about rifles? In shotguns, the stock is crucial because, on the one hand, shots are usually taken while moving both at the shooting range and during hunting. On the other hand, shotguns have much fewer aids for an accurate shot: they typically do not have scopes, red dot sights, etc.
To consistently hit the target, the shooter must adopt a natural and reproducible body position when shooting a shotgun, so that each shot is repeatably accurate and reliably on target. Shotgun stocks can therefore be highly individualized: the cast (lateral bend of the buttstock), the pitch (the angle of the buttstock end to the barrels), and the stock length can vary significantly from one shotgun to another.
In contrast, rifles are aimed using a scope and are usually not shot while moving. This significantly lowers the ergonomic requirements for rifle stocks. Most rifles are delivered from the factory in a standard stock size. Only for particularly large and particularly small shooters may special stocks be absolutely necessary. Usually, a stock pad extension or shortening can make a significant difference if the stock in its standard version does not fit.
For the interested party, this means: For shotgun stocks, consultation may be necessary, and in any case, a new purchase should be tried out. For rifles, the standard stock size in which the model is delivered is usually sufficient.