A Beretta 92FS Inox is used by Kevin Gray (Stephen Thompson) near the end of "More Yang Than Yin". Governor Nikhail Julian (Sendhil Ramamurthy) uses it briefly in "Leap of Faith" before forcing Harry Clayton to use it.
Glock 17
A Glock 17 is used to assassinate a VIP at the start of "The Last Chance". DI Clayton uses it to intimidate Charles near the end of "My Brother's Keeper". Some of Governor Julian's security personnel use them in "Leap of Faith".
Heckler & Koch P30
A Heckler & Koch P30 is seen briefly with Yury Becker (Joseph Gatt) in "Win Some, Lose Some". Some of Governor Julian's security personnel use them as their main sidearm in "Leap of Faith".
Percussion Dueling Pistol
A matched pair of Percussion Dueling Pistols were handled briefly by Detective Inspector Harry Clayton (James Nesbitt) inside Herald Antiquities in "More Yang Than Yin". It's later seen, used as a murder weapon in "My Brother's Keeper".
SIG-Sauer P220R
A SIG-Sauer P220R is used by Charles Collins (John Hopkins) in "Leap of Faith" when he tries to assassinate Clayton.
SIG-Sauer P226 X-FIVE
A SIG-Sauer P226 X-FIVE is used by Kirsty Danvers (Katie Lyons) to shoot at Clayton, but shot DS Alistair Winter instead in "Leap of Faith".
Taser X26
A Taser X26 pistol is used by a City of London police officer for non-lethal situations in "The Charm Offensive".
Tokarev TT-33
A Tokarev TT-33 is used in "Evil Eye" by Nelson (Paudge Behan), later used by DI Clayton after Nelson is disarmed.
Unknown
Revolvers
Smith & Wesson Model 10 HB
A Smith & Wesson Model 10 HB is used by Jed (Ollie Marsden) to shoot at Clayton near the end of "The Charm Offensive". He, however, messes up his shots against him.
Smith & Wesson Model 66
A Smith & Wesson Model 66 is used by Yury (Joseph Gatt) to intimidate Eve and Clayton near the end of "A Higher Power". It's briefly seen in "The Last Chance".
Submachine Guns
Heckler & Koch MP5K
A Heckler & Koch MP5K is seen with Governor Julian's security personnel in "Leap of Faith".
Shotguns
Single Barreled Shotgun
What appear to be Single Barreled Shotguns are seen on display in the Collins residence in "My Brother's Keeper".
Rifles
Colt M16A4
Colt M16A4s are seen in an archive photo of US Marines in "My Brother's Keeper".
LMT LM308MWS Sharpshooter
A LMT LM308MWS Sharpshooter is used by Collins in a bid to assassinate DI Clayton in "My Brother's Keeper".
Lee-Enfield No.1 Mk.III*
A Lee-Enfield No.1 Mk.III* is seen on display at the Collins residence in "My Brother's Keeper".
SIG-Sauer 516
Several SIG-Sauer 516 carbines are seen with responding CLP Tactical Firearms Group operators in "Leap of Faith".