A "Mod APK" is a version of the game that has been altered by third parties to unlock features not available in the official version. Common modifications for Cover Fire include:

Features over 60 story-based missions, diverse characters (snipers, hackers, etc.), and high-quality HD graphics.

It is well-regarded for being playable offline , making it a popular choice for mobile gaming without an internet connection. The Modified File ("Mod APK")

Granting "Unlimited Money" or "Gold" to bypass the grind of earning currency for weapon upgrades.