Benjamin Turtell, an animator at New World Interactive, may have created this reload as a reference to one of his comedic reload animations uploaded to his Youtube channel, Mrbrightside.
A very similar empty reload animation exists for Day of Infamy's M1911.
The game files also indicate that the M45 is the only pistol in the game to have a secret reload.
The M45 has a unique empty reload animation that shows the player inserting the magazine through the ejection port.
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Also some update later, the designation was changed from "M45" to "M45A1.".
Before December 19 update, the in-game model was simply a retexture of the Insurgents' M1911.
The in-game models for the M45 in Insurgency: Modern Infantry Combat and Insurgency video games are based on the M45 MEUSOC pistol (with the latter game incorrectly designating the weapon as an "M45A1"), while the model from Insurgency: Sandstorm is based on the M45A1 CQBP (strangely designated as an "M45").