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Peacemaker is an action comedy series intended to serve as a spin-off to James Gunn's The Suicide Squad. It follows the titular Peacemaker/Christopher Smith (John Cena), after being paroled from Belle Reve federal prison on the condition that he complete a series of contract killings on metahumans known as "butterflies".
The following weapons were used in the television series Peacemaker:
Emilia Harcourt (Jennifer Holland) carries a second generation Glock 20. "In Better Goff Dead", she tells Peacemaker that her first Glock was a Glock 20, a gift from her parents when she was 12 years old. Interestingly, just a few minutes later we see her drop one, and the smooth grip and lack of an accessory rail clearly identifies it as a second generation. Assuming that the character is intended to be the same age as the actress, then her 12th birthday would have been just as Glock was winding down production for Gen 2s, and thus it's entirely possible that she received a Gen 2 for her birthday and that she still carries that same pistol. Even today, Gen 2 Glocks are still kicking around in good condition, so it's entirely plausible.
Interestingly, when Peacemaker hears of a 12 year old getting a Glock 20, he says "that's a lot of gun for a little girl". He's got a good point, as the Glock 20 was actually adopted by the Federal Bureau of Investigation, but the 10mm Auto cartridge was too powerful and recoil proved hard to handle, leading to the invention of the .40 S&W, a weaker version of the same round.
Peacemaker aka Christopher Smith (John Cena) carries the same modified stainless Desert Eagle Mark XIX from The Suicide Squad. It appears to be a custom barrel attachment just slipped over the standard 10" barrel, akin to The Boondock Saints II: All Saints Day. Peacemaker is somewhat a parody character and extreme and somewhat comically over the top violence is a common motif, so it would check out that he would be equipped with an absurd handgun so pointlessly large that even a completely gun-illiterate viewer could pick up on the joke.
Clemson Murn (Chukwudi Iwuji) uses a SIG-Sauer P226R, being his personal sidearm. "In Better Goff Dead", Murn gets an additional one out of a crate to hand to Leota Adebayo (Danielle Brooks).
Vigilante aka Adrian Chase (Freddie Stroma) uses a two-tone Walther P99 with a slightly bronzy-tinted stainless steel slide, which he keeps in a hip holster when not in use.
The MasterPiece Arms MPA30DMG is used in "Best Friends for Never" by Adrian. While clearly being the submachine gun variant, it seems that Adrian took the folding stock and the first 4 inches of the handguard off of its larger carbine variant, the MPA300DMG. He also uses it with BCM Mod 3 Vertical grip and a raised reflex sight.
A M67 hand grenade taped to a Russian-made tank gun shell is used by Christopher to take out several Butterfly-infected humans in "Monkey Dory". In real life, this is a very common way of making cost-effective IEDs in locations where Russian military surplus is common and cheap, as the tank shell is much more powerful than it would ever be when fired, due to the propellant also burning up.
