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The following weapons were used in Season 31 of the anime series Case Closed:
A Heckler & Koch USP with a suppressor is now the sidearm of Black Organization agent Gin.
IMI Jericho 941
The IMI Jericho 941 is the personal sidearm of FBI agent Shuichi Akai, who previously went undercover in the Black Organization.
M1911A1
The M1911A1 is seen with London-based Black Organization agents.
SIG-Sauer P230
The SIG-Sauer P230 was used by Mary Sera in a flasback to London near the end of "The Birthday Party of Divine Punishment (Part 1)".
Tokarev TT-33
The Tokarev TT-33 is seen in an eyecatch in "Stakeout". The pistol makes its first actual appearance in "The Monorail Sniper Case (Part One)", followed by "The Monorail Sniper Case (Part Two)".
Walther P38
A pistol lighter based on the Walther P38 is seen throughout "The Figure of Revenge" with Kazuya Shiraishi.
Revolvers
Nambu Model 60
The Nambu Model 60 is seen with officers of the Tokyo Metropolitan Police.
Smith & Wesson Model 36
FBI agent Jodie Starling is seen holding her Smith & Wesson Model 36 revolver during the OP sequence, "SPARKLE" and in the ED sequence, "Kuufuku".
Smith & Wesson Model 360
The Smith & Wesson Model 360 is seen throughout "Police Academy Arc Wild Police Story CASE. Matsuda Jinpei" and in "Police Academy Arc Wild Police Story CASE. Rei Furuya", the latter via flashbacks, with cadets from the Tokyo Metropolitan Police Department Academy.
Shotguns
12 Gauge Double Barreled Shotgun
An over and under-type 12 Gauge Double Barreled Shotgun is used in "Whiteout (Part One)" by Kengo Ishibashi and Takeru Yokoyama.
Remington Model 870
The Remington Model 870 is seen with armed robbers and a Nowson employee on a heist in "Police Academy Arc Wild Police Story CASE. Date Wataru" and in "Police Academy Arc Wild Police Story CASE. Rei Furuya", the latter via flashbacks.
Bolt-Action Rifles
Mosin Nagant Rifle
Several Mosin Nagant Rifles are found by Conan Edogawa and Morikawa Family butler Tomoka Tsukasa after Yuichiro Morikawa was killed in "Intrigue at Morikawa Mansion (Part 2)".
Sniper Rifles
Accuracy International Arctic Warfare
The Accuracy International Arctic Warfare is seen with Akai as his primary weapon.
Heckler & Koch PSG-1
The Heckler & Koch PSG-1 is seen with Black Organization agent Chianti.
PTRS-41
A scopeless PTRS-41 is used by Gin to take out the kei car Camel uses in "The Black Organization's Scheme (Hunt)".
Remington M24
The Remington M24 is seen with Black Organization agent Korn.
Winchester Model 70
A Winchester Model 70 with a scope is found by Conan and Tsukasa after Yuichiro was killed in "Intrigue at Morikawa Mansion (Part 2)". FBI agents in Japan use them to flush out Chianti and Korn from "The Black Organization's Scheme (Hunt)".
Others
Crossbow
A crossbow is used by a murder suspect in "The 36-Cell Perfect Game (Part Two)". Another is seen in "Yoko Okino and the Locked Attic (Part 1)".