This mod is based on the EngiGamingRedux mod, which itself was based on another mod called EngiGaming. (Both are long deprecated and unusable in modern game versions.) The original EngiGaming mod added three new skills to the Engineer, but its main purpose was really just to provide a different M1 skill, as the default one is rather underwhelming.
This mod focuses purely on the alternative m1 and does not include the other two skills. His alternative M1 is a powerful automatic Gauss Shotgun that excels at close-range self-defense but lacks AoE and mid-to-long-range capabilities, and it suffers from falloff. It was made primarily to make playing Engineer more engaging.
Versions:
0.3.0
0.2.0
0.1.0