Person of Interest - Season 4

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=Pistols=
==SIG-Sauer P226R==
In his new cover identity as an NYPD detective, John Reese (Jim Caviezel) is seen carrying his SIG-Sauer P226R in Season 4's premiere "Panopticon" (S4E01). He isn't seen using the pistol again until "Prophets" (S4E05).
==SIG-Sauer P229R==
In a continuity error, Root appears to pull out a SIG-Sauer P229R alongside a Smith & Wesson 3914 from behind her back near the end of "Prophets" (S4E05). The pistol later turns into a Smith & Wesson M&P Shield. Several of the Samaritan operatives are armed with the pistol in the episode. Brooks (Theodora Wooley) and Devon Grice (Nick Tarabay) are armed with the P229R as their main sidearm, first seen near the end of "Honor Among Thieves" (S4E07). This pistol also appears to be used by NYPD Internal Affairs officer Dani Silva (Adria Arjona) in "Point of Origin" (S4E08) as her main sidearm and by Martine (Cara Buono) in "The Devil You Know" (S4E09). In "Skip" (S4E18), Francesca “Frankie” Wells (Katheryn Winnick) is seen using a SIG-Sauer P229R. Control (Camryn Manheim) uses it throughout "Asylum" to execute pro-Samaritan moles.
thumb|none|300px|SIG-Sauer P229R
 
==American Tactical Imports FS9 Sport==
Dominic (Winston Duke) uses this as his sidearm in "Asylum" he executes Link of being a double agent for Elias.
==Beretta 92FS==
The Beretta 92FS is seen with Floyd (Jessica Pimentel) throughout "Blunt" (S4E16).
==Glock 17==
The Glock 17 appears to be the handgun carried by Reese in several episodes, beginning in "Wingman" (S4E03). It also appears that Det. Lionel Fusco (Kevin Chapman) also carries this pistol instead of the Model 19 he carried in earlier episodes. NYPD cadets are seen using Glocks that fire paintballs in "Point of Origin" (S4E08). Some NYPD officers are seen with it in "If-Then-Else" (S4E11). Albert Weiss in "M.I.A." (S4E13) briefly seizes Fusco's sidearm before he gets gunned down. Claire Mahoney uses it after being recruited to Samaritan's forces, first seen in "Q&A" (S4E15).
In reality, the Glock 19 is the only Glock approved for onduty carry by NYPD officers. 
==Glock 19==
The Glock 19 continues to be carried by the majority of the NYPD officers in the series. Root appears to use the pistol in "Wingman" (S4E03). A disgrunted man uses a Glock 19 seized from a NYPD officer he gunned down in "Prophets".
==Glock 26==
Reese is seen holding a Glock 26 and tossing it to a suspect in "Prophets" (S4E05). In "Skip" (S4E18), Francesca “Frankie” Wells (Katheryn Winnick) is seen using a Glock 26 to put a hole in a wall and then tossing to the ground.
==Colt M1911A1==
A Colt M1911A1 pistol is pulled by Walter Dang (Erik Jensen) while he impersonates an NYPD detective in "Pretenders" (S4E06). Scarface uses it as his sidearm throughout "The Devil You Know" (S4E09). Gil (Patch Darragh) uses one near the end of "Terra Incognita" (S4E20).
==Colt Mustang Plus II==
What appears to be a Colt Mustang Plus II is another of the many pistols seen wielded by Root in "Prophets" (S4E05). It's seen again in "M.I.A." (S4E13) with a mounted silencer.
==CZ-75==
A CZ-75 pistol is used by a member of the Brotherhood in Season 4's premiere "Panopticon" (S4E01). He's holding it "gangsta"-style and Reese tries to explain how it can't be aimed that way (like he said in the pilot episode).
==Heckler & Koch USP Compact==
Shaw (Sarah Shahi) continues to carry a Heckler & Koch USP Compact as her weapon of choice. Root uses a suppressed USP Compact, first seen at the end of "Q & A" (S4E15). 
==Heckler & Koch HK45C Tactical==
A Heckler & Koch HK45C Tactical with a silencer is briefly seen in "Q&A" (S4E15) by a rogue security contractor.
==Heckler & Koch P30==
One of Elias' men is armed with a Heckler & Koch P30 in "Pretenders" (S4E06). Rogue security contractors use them near the end of "Q&A" (S4E15). Elias pulls a P30 on Reese and Fusco in the beginning of Asylum (S4E21). 
==Jericho 941RPL==
A Jericho 941RPL is used by members of the Brotherhood, notably by "Link" in "Brotherhood" (S4E04). A Jericho is found in a duffel bag in "Karma" (S4E17) and another is used by Elia's soldier in "Asylum" (S4E21). The style of the rear sight indicates it is a current production model. 
==Jericho 941FB (Stainless)==
A stainless Jericho 941FB Compact is used by one of Elias' men in "Pretenders" (S4E06). 
==Ruger P89==
A Ruger P89 is the pistol seen in the hands of the Armorer and later is used by Anthony S. Marconi to take out the Armorer after the latter tries to shoot Elias near the end of "The Pretenders" (S4E06).
==Smith & Wesson M&P Shield==
Martine (Cara Buono) appears to pull a Smith & Wesson M&P Shield on a reporter in Season 4's premiere "Panopticon" (S4E01). Claire Mahoney (Quinn Shephard) draws out a similar Smith & Wesson M&P Shield pistol in "Nautilus" (S4E02). This pistol also appears to be one of the guns used by Root in "Prophets" (S4E05).
==Smith & Wesson M&P Compact==
Control pulls a Smith & Wesson M&P Compact pistol in "Control-Alt-Delete" (S4E12). 
==Smith & Wesson 3914==
What appears to be a Smith & Wesson 3914 is seen wielded by Root in "Prophets" (S4E05).
==Smith & Wesson 469==
One of the Brotherhood gunmen is seen holding a Smith & Wesson 469 in "Pretenders" (S4E06).
thumb|none|300px|Smith & Wesson 469 - 9x19mm
==Star Firestar==
In "Karma" (S4E17), Shane Edwards (Patrick Kennedy) pulls a Star Firestar pistol during a confrontation.
==Walther PPK (Stainless)==
A stainless Walther PPK is another of the many pistols seen wielded by Root in "Prophets" (S4E05). Greer use a stainless version to assassinate a POI at the end of "Search and Destroy". A PPK is used by a young John Greer (Emrhys Cooper) when he was with MI:6 in "The Cold War" (S4E10). Greer (John Nolan) then is seen using it in "Search and Destroy" (S4E19).
 
==Walther P88 Compact (Replica)==
In "Wingman" (S4E03), Janis (Jamie Jackson) pulls what appears to be a stainless Walther P88 Compact on Harold. Upon closer inspection, this appears to be a Umarex blank replica. The pistol later is seen in the hands of Root (Amy Acker).
==Walther P99==
The Walther P99 is the weapon of choice for Martine (Cara Buono) in "Prophets" (S4E05). 
=Submachine Guns=
==Cobray M11/9==
A Brotherhood gangster uses a Cobray M11/9 to assassinate a POI in the middle of "Point of Origin".
== CZ Vz. 61 E Skorpion ==
One of the Latvian mobsters appears to be armed with the CZ Vz. 61 E Skorpion in "Wingman" (S4E03).
==FN P90T==
Shaw uses an FN P90TR when she engages Martine at the start of "The Devil You Know" (S4E09).
==Heckler & Koch MP5K==
One of the Latvian mobsters appears to be armed with a Heckler & Koch MP5K in "Wingman" (S4E03). A Parrel cartel soldier uses it briefly in "Blunt" (S4E16).
==Heckler & Koch MP5K-PDW==
A Heckler & Koch MP5K-PDW is used by a Brotherhood gangster without a stock near the end of "Pretenders" (S4E06). An MP5K-PDW also is used by Root in Season 4's finale "YHWH" (S4E22).
==Heckler & Koch MP7A1==
Heckler & Koch MP7A1s are used by Reese and Root when the former seizes them from the armory of the Maple Police Department in "M.I.A." (S4E13) Reese also uses one in Season 4's finale "YHWH" (S4E22).
thumb|none|350px|Heckler & Koch MP7A1 with factory magazine and iron sights - 4.6x30mm
==Para-Ordnance Model 85==
One of the Brotherhood gunmen is briefly seen holding what appears to a MAC-11-type SMG in "Pretenders" (S4E05). Upon closer inspection, this particular weapon appears to be a Para-Ordnance Model 85 "Dye-marking tactical pistol".
== Madsen M50 ==
One of the Latvian mobsters appears to be armed with a Madsen M50 in "Wingman" (S4E03).
==Smith & Wesson 76==
The Smith & Wesson 76 is seen with some of the Parrel Cartel soldiers throughout "Blunt" (S4E16).
thumb|none|500px|Smith & Wesson M76 with stock extended - 9mm‎
=Assault Rifles=
==Norinco Type 56==
The Norinco Type 56 is frequently seen in the hands of Brotherhood soldiers working under Link in "Panopticon" (S4E01). Reese later uses the rifle after disarming a gang member of his weapon. They are seen in the hands of Brotherhood members again in "Brotherhood" (S4E04). The rifles are also used by both Reese and Fusco in the episode.
==Norinco Type 56-1==
A Norinco Type 56-1 is used by a Brotherhood soldier in "Asylum" and by Floyd briefly in "YHWH" before Reese wounds her in the leg.
==Colt M4A1==
The Colt M4A1 is held by Silverpool contractor in "Nautilus" (S4E02). A Samaritan agent disguised as a janitor uses one in "If-Then-Else" (S4E11). Reese uses it near the end of "Search and Destroy" to take out Samaritan agents.
==Colt Law Enforcement Carbine==
A Colt Law Enforcement Carbine modified to fire paintball rounds is used by Reese in "Point of Origin" while serving as a training instructor. It's seen briefly in the hands of ESU operators in "YHWH".
==FN SCAR-L==
A FN SCAR-L with a loaded Magpul magazine, EOTech sight and tactical light is seen in the arsenal of the Latvian mob near the end of "Wingman" (S4E03).
==Heckler & Koch G36C==
A Heckler & Koch G36C is seen at the end of "Wingman" (S4E03) next to a loaded FN SCAR-L. In Season 4's finale "YHWH" (S4E22), Reese uses one with a C-drum magazine.
==SIG SG 550==
An SIG SG 550 is seen used by an arms dealer in "YHWM" (S04E22)
=Sniper Rifles=
==Nemesis Arms Vanquish==
Shaw uses a Nemesis Arms Vanquish with a mounted suppressor to assist Reese in saving a hostage near the end of "Panopticon" (S4E01). The rifle also is used in "Control-Alt-Delete" by Brooks in an ISA op (S4E12). Reese uses it near the end of "Search and Destroy" to take out security cameras used by Samaritan to locate the POI.
==Remington 700PSS==
What appears to be a Remington 700PSS is used by a Silverpool contractor to assassinate Claire near the end of "Nautilus" (S4E02). Reese uses one outfitted with a riflescope and laser sight near the end of "Guilty" (S4E14) in order to communicate via morse code due to Finch's mobile phone being confiscated by the police as part of his jury duty. 
=="Barrett XM109" (modified Barrett M107CQ)==
What appears to be a Barrett M107CQ dressed up as a Barrett XM109 is featured throughout "Pretenders" (S4E06) as members of the Brotherhood are seen illegally importing the sniper rifles into New York City. Both Reese and Shaw specifically identify the weapon as a "Barrett XM109" and the rifle is said to be loaded with HE rounds. Later in the episode, Elias' right hand man Anthony S. Marconi (David Valcin), aka "Scarface" is seen using the rifle during the shootout with the Brotherhood. It is equipped with a Barrett BORS (Barrett Optical Ranging System) ballistic computer on top of a Leupold Mark 4 M1 riflescope.
==Desert Tactical Arms Stealth Recon Scout==
In "Pretenders" (S4E06), Shaw is seen using a Desert Tactical Arms Stealth Recon Scout rifle to take out a Brotherhood sniper.
==DPMS Panther LRT SASS==
Reese uses a DPMS Panther LRT SASS to provide overwatch in "The Cold War" (S4E10).
 
==Ruger M77 ==
In "YHMH" (S4E22), a suppressed .308 chambered Ruger Model 77 bolt-action in a synthetic all weather stock appears to be the rifle used by the Samaritan assassin to take out several targets.
=Shotguns=
==12 Gauge Double Barreled Shotgun==
Martine takes a "Coach" Style shotgun off a gunman and uses it to fire buckshot in "Point of Origin" (S4E08).
thumb|none|500px|Remington SPR220 Shotgun Exposed hammer Cowboy Action Gun - 12 gauge‎
==Remington 870==
A Remington 870 with a short barrel is seen used by a Brotherhood soldier in "The Devil You Know" (S4E09).
== Armsel Protecta==
In Season 4's finale "YHWH" (S4E22), Reese is seen using what appears to be an Armsel Protecta. Instead of a shotgun, the weapon is depicted as being a grenade launcher, as Reese appears to use it to launch smoke grenades into the street.
==Ten-X Tactical TX-12 STW==
An arms dealer is seen using a Ten-X Tactical TX-12 STW underbarrel-mounted 12 gauge firearm in "YHWH" (S4E22). The TX-12 STW is mounted on a SIG SG 550 and was used in an attempt to penetrate an elevator door.
=Grenades=
==M26 Grenade==
A couple of M26 frag grenades are seen in a gun safe at the subway hideout near the end of "Honor Among Thieves" (S4E07).
==Mk II hand grenade==
Mk II hand grenades in a bandolier are used by Reese in "Point of Origin" (S4E08). A grenade is seen in the hand of Reese in "If-Then-Else" (S2E11).
==Model 7290 Flashbang==
A couple of Model 7290 flashbang grenades are seen in a gun safe at the subway hideout near the end of "Honor Among Thieves" (S4E07).
==Smoke Grenade==
Root uses a smoke grenade to blind Samaritan agents near the end of "Prophets" (S4E05).
=Launchers=
==CAW 40mm Grenade Launcher==
Reese uses a multi-shot grenade launcher loaded with flashbang rounds during a raid on a Brotherhood hideout in Season 4's premiere "Panopticon" (S4E01). Close examination reveals that it is not actually a real grenade launcher, but rather a CAW 40mm Grenade Launcher airsoft launcher. It has been modified with an adapter to allow it to fit and AR-15 stock, and mounts a red dot sight and vertical grip.
thumb|none|401px|CAW Airsoft Launcher fitted with AR-15 stock - (fake) 40mm
==M136 AT4==
In "Wingman" (S4E03), Root is seen purchasing an M136 AT4 to in turn with Finch sell the launcher to the Latvian mob. Reese uses the launcher in "Control-Alt-Delete" (S4E12). A launcher also is seen in Elias' armory in "Pretenders" (S4E06).
==Defense Technologies 1315 37mm==
In Season 4's finale "YHMH" (S4E2), Reese is seen loading up the Def Tech 1315 launcher before engaging the Samaritan operatives. However, this isn't the launcher he is seen using when he enters the street.
=Other=
==X26 Taser==
A Nautilus competitor is armed with a X26 Taser in "Nautilus" (S4E02).
==Elias' Weapons Room==
In "Pretenders" (S4E06), Reese is seen meeting Elias in one of his hidden armories.
 
==Arms Deal==
In "YHWH", an arms deal was done in a New York penthouse with a variety of small arms.
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