Colt Mk.40 L45 Automatic Cannon - introducing a powerful, lore-friendly 20mm autocannon to the game. Designed by modder The6thMessenger, itโs a heavy weapon tailored for players who want to dominate tough enemies like power-armored foes, lightly armored vehicles, or even aircraft in theย Falloutย universe. The weapon was chosen for its low rate of fire and ability to handle high-pressure cartridges, making it lightweight yet devastating. Itโs versatile, capable of firing various ammunition types, including explosive shells, to tackle a range of targets from fortified structures to thin-skinned enemies.
Features Colt Mk.40 L45 Automatic Cannon:
- 20mm Autocannon: Fires high-powered 20mm rounds, offering superior penetration and damage compared to .50-caliber weapons. Effective against power armor, vehicles, and structures.
- Select-Fire Mechanism: Allows switching between semi-automatic and automatic modes, giving players flexibility in combat.
- Ammo Variety: Supports multiple ammunition types, including explosive shells for area damage and armor-piercing rounds for tough targets. The mod includes an innate ammo-switching system, with patches for compatibility with mods likeย Munitionsย orย Weapons Overhaul System (WOS).
- Lightweight Build: Designed for portability despite its firepower, using a recoil cradle to manage the intense kick of 20mm rounds.
- Offers various modifications, such as barrels, sights, and magazines, to tailor the weapon to different playstyles.
- Experimental mods can be found in the Commonwealth, adding unique effects akin to legendary perks, enhancing the weaponโs versatility.
- AC115 Thresher: A legendary version of the cannon with an accelerated fire rate, described as โburning up the chaff with unquenchable fire.โ Itโs located underwater near a buoy by Rock Point Camp in theย Far Harborย DLC, making it a rewarding find for explorers.



