The M1IP Abrams was a mid-1980s interim upgrade of the M1 Abrams, featuring improved armor, suspension and other refinements. It served as a transitional step toward the M1A1. However, it was still using the M68A1 105mm gun.

In-game the M1IP is a great turret giving you pretty good protection. His cheeks can block literally any t11 sabot rounds. Anyways, it still has weakspots like big gun mantlet and turret ring. It has zero difference from M1 except his armor, meaning that his thermals, FCS and others are completely same. Even with that, it’s still great thanks to his upgraded armor and giving you more couple of seconds while your enemy will try to aim your weakspots.
It’s highly recommended to use it in T11 and sometimes downtier to T10