M1

• Diazepam - [筋しかん剤] increases this gun's damage by 50%.
• M1 Multi-Tool - If the player also has [スコープ] , [ドラムクリップ] , [弾薬ベルト] , [バックパック] , or [ユーティリティベルト] , M1's reload time is decreased by 20%, its magazine size is increased by 50%, and its maximum ammo is increased by 80%. Movement speed is also increased while M1 is held.
• Mmmmmmmmm MMMMmm! - If the player also has [M16] and [M1911] , the damage, maximum ammo, and rate of fire of all three guns is increased by 25%.
• Smile, you son of a... - If the player has [圧縮空気タンク] , its sharks will explode upon biting an enemy. These shark explosions can damage the player.
• Sniper Woof - If the player has [オオカミ] , M1's reload time is decreased by 30%. Standing still for long enough causes the player to glow yellow, making M1 shots deal 50% more damage. Sniper Shells and Professionals become permanently charmed.
• Although classified as semi-automatic, the M1 is functionally automatic, as its rate of fire does not benefit from tapping the fire button instead of holding it down.

• Unused: The Great War - If the player has [グレイ・ミャウザー] , it causes an unknown effect.
• Altered: Diazepam - Prior to the [トランシーバー] Update , Diazepam tripled damage instead of increasing it by 50%.
• While it only has six shots instead of eight, the description, shape (such as the band around the rifle's forend), and the distinctive pinging reload noise suggest this rifle is the M1 Garand , the famous semi-automatic rifle that served as the mainstay of the US Army in World War 2. It could also be the later M1 Carbine based on the detachable box magazine (though this might lead one to expect a magazine capacity of 10, 15, or 30 and no distinctive "ping"). However, the weapon in-game is listed as bolt action while both real-life counterparts are semi-automatic.
• The synergy M1 Multi-Tool is a reference to the MIDA Multi-Tool from the Destiny series. The boost to movement speed is based on MIDA's unique perk, and its appearance resembles a scout rifle from the Destiny series. It resembles an M14 battle rifle, which was a replacement for the M1 Garand battle rifle using box magazines rather than an internal en-bloc-clip-fed magazine, and was capable of select-fire.
• The synergy Smile, you son of a... is a reference to the final scene of the movie Jaws, where Martin Brody shoots a gas tank in a shark's mouth with an M1 Garand, making it explode.
• The synergy Sniper Woof is a reference to Metal Gear Solid's Sniper [オオカミ] character.
• The name of the Mmmmmmmmm MMMMmm! synergy is likely a reference to the distinctive guitar notes prefacing each verse in "Fortunate Son" by Creedence Clearwater Revival. Both the song and all three guns are heavily associated with the Vietnam War.

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