Heavier recoil guns will use which type of mounting screw holes?

Heavier recoil guns typically utilize 8-40 mounting screw holes because they offer a balance of strength and size that is ideal for managing the stresses associated with increased recoil. The 8-40 screw size is robust enough to secure optics or other accessories securely without stripping or failing under high recoil conditions.

In the context of firearm optics, a heavier recoil can cause more strain on the mounts, making it essential to choose a screw size that provides sufficient holding power. The 8-40 size strikes an optimal balance for stability and durability, ensuring that the optics remain securely attached and maintain zero even after repeated firing.

Other screw sizes, though they might be suitable for lighter or less powerful firearms, do not provide the same level of reliability and strength under the demanding conditions posed by heavy recoil. Hence, the 8-40 size becomes the preferred choice among manufacturers and firearm enthusiasts for these applications.