A gun comb, specifically in the context of a shotgun, is the part of the stock that rests against the shooter's cheek, and is often adjustable using inserts or risers of varying thicknesses to achieve proper eye alignment with the sights or the rib. These adjustments ensure the shooter looks directly down the barrel for accurate aiming.
Essentially, the comb is the top part of the gun stock where your cheek makes contact when you shoulder the weapon. Adjusting the comb's height (often with inserts) alters the point of impact, allowing shooters to fine-tune their shotgun for optimal performance and a comfortable, consistent fit.
