The M1911A1 is seen in "The North Star No. 3 Express Leaving Ueno (Part 1)" with Yasuji Asama inside the North Star Express to assassinate Keitaro Izumo. It shows up again in "The North Star No. 3 Express Leaving Ueno (Part 2)" as part of a background image. It's used in "Metropolitan Police Detective Love Story (Part 1)" in a flashback sequence when a bank robber stages a heist. However, the animation done make it look generic.
Nambu Model 60
The Nambu Model 60 is seen with Assistant Inspector Miwako Sato of the Tokyo Metropolitan Police Department in "Metropolitan Police Detective Love Story 2 (Part 1)".
Single Barreled Shotgun
A Single Barreled Shotgun is seen in "The North Star No. 3 Express Leaving Ueno (Part 1)" in a gun bag under Azusa Izumo's possession. Inspector Nishimura is only seeing examining the barrel, so there are no concrete details on the weapon itself beyond the barrel. It shows up again in "The North Star No. 3 Express Leaving Ueno (Part 2)" as part of a background image, this time with more details on the full weapon.