Throat erosion is primarily caused by pressure and heat as I understand it, how does an SBR change either? Genuinely curious I have never heard barrel length as a contributing factor to it.
FOUND IT!!! I was worried I wouldn't be able to find my reference material.
https://www.thefirearmblog.com/blog/2015/09/08/ar-endurance-findings-at-a-rental-range/