Bryan Hill / September 13 2021
Bore axis refers to how far the barrelis above your hand when you grip it.
This has a moderate effect on muzzle rise in recoil. Why? The pistol's grip is like a lever. Recoil comes from the barrel and slide, pushing against that lever.
The lower your grip relative to the barrel, the more recoil has leverage against you, and the more the muzzle will rise compared to other pistols.
Why does bore axis only have a moderate effect on recoil? It doesn't vary much from pistol to pistol:
An exception is the Chiappa Rhino, which sets the barrel in line with your hand:
Its design has a major effect on muzzle rise. However, it's a revolver, so it has worse capacity and reload speed compared to a semi-auto pistol, and the price starts around $1000. The costs aren't worth the benefit, or else designs like this would be more popular.