Season 3 of True Detective features Mahershala Ali as Wayne Hays and Stephen Dorff as his partner Roland West, two state police detectives from Arkansas investigating a macabre crime involving two missing children across three time periods (1980,1990 and 2015). Nic Pizzolato, who wrote all eight episodes of Season 1, scripted all eight episodes of Season 3, with David Milch and Graham Gordy assisting him in scripting two, and several episodes were directed by Jeremy Saulnier as well as by Pizzolato. Season 3 premiered on HBO on January 13, 2019.
The following weapons were used in Season 3 of the television series True Detective:
Special Agent John Bowen (Michael Broderick) of the FBI carries a 4" Smith & Wesson Model 19 as his sidearm in 1980 and uses it in the shootout in "If You Have Ghosts" (S3E05).
Smith & Wesson Model 15
An ASP officer in 1980 is briefly seen armed with a Smith & Wesson Model 15 in "If You Have Ghosts" (S3E05). In "The Final Country" (S03E07), Detective Wayne Hays (Mahershala Ali) is seen using a Model 15 instead of his Colt Python in a continuity error.
Assault Rifles
M16
In "The Great War and Modern Memory", Hays and West inspect a photo of US soldiers in Vietnam with their M16 SP1 rifles. In "Now Am Found" (S3E08), it's seen with Hays while he remembers his time as a LRRP soldier in the Vietnam War.
AKM
In Hays' hallucination, NVA and VC soldiers are armed with AKM rifles in "The Hour and the Day" (S3E04). In the same episode, Brett Woodard (Michael Greyeyes) pulls out an AKM when confronting some men in his home. (Note: if the battle in S3E04 happens in 1980, then the AKM must be some rare bring bang firearm that Woodard acquired as a Vietnam Veteran. No civilian models of the AKM were available to the American public until 1983. All other communist based firearms were individual bring backs until the importation restrictions on Combloc weapons was lifted for a few nations with special trade status in 1983 - most notably China and Yugoslavia. In 1983, Egypt (aka Maadi) was able to import their own domestic versions of the AKM).
Ruger Mini-14 GB
Brett Woodard (Michael Greyeyes) pulls out a Ruger Mini-14 from a bag of weapons in "The Hour and the Day" (S3E04). This is historically correct since the Mini 14 was introduced in 1973.
Carbines
SKS
In Hays' hallucination, an SKS rifle is held by a VC fighter in "The Hour and the Day" (S3E04).
Muzzleloaders
Springfield 1861
What seems to be a Springfield 1861 is seen in "Hunters in the Dark" (S306).
Sniper Rifles
Remington Model 700
The Remington Model 700 is seen in a photo in "Hunters in the Dark" (S3E06).
Shotguns
Ithaca 37
The Ithaca 37 is seen in "The Hour and the Day" (S3E04) with a vigilante going after Woodard.
Remington Model 870
A Remington Model 870 is seen in "The Hour and the Day" (S3E04) with a vigilante going after Woodard.
Grenades
M26 Hand Grenade
An M26 hand grenade is seen being rigged by Woodard (Michael Greyeyes) on a tripwire at the end of "The Hour and the Day" (S3E04).
M18 smoke grenade
An M18 smoke grenade is carried by Hays while in Vietnam in Season 3's finale "Now Am Found" (S3E08).