At least 2 SIG-Sauer P226 pistols are seen in Season 1 in the case that was in the possession of Deputy US Marshal Edward Mars (Fredric Lane). The pistols are seen used by several of the characters throughout the season. Jin (Daniel Dae Kim) checks the SIG in "The Glass Ballerina" (S3E02).
In "The Glass Ballerina" (S3E02), a second generation Glock 17 is used by Juliet to hold Kate at gunpoint. The Glock logo can clearly be seen on the side of the gun.
Tom Friendly (M.C. Gainey) is seen with a Luger P08 in Season 3's "Through the Looking Glass, Part 1". He drops it at one point and Juliet picks it up.
The Norinco Type 54 pistol (Chinese-made version of the Tokarev TT-33) is seen among the guns in the Swan Station's armory and then is among the guns that John was transporting back to the compound in "Further Instructions" (S3E03).
Walther P38s are seen multiple times over the course of the series, starting in Season 2. In "I Do" (S3E06), several P38s are visible when Jack (Matthew Fox) goes into the Hydra station gun vault. In "Greatest Hits" (S3E21), Bonnie (Tracy Middendorf) carries a P38 while in the Looking Glass station.
In Season 3's "Through the Looking Glass, Part 1", Locke is seen taking a Smith & Wesson Model 10 from the body of deceased Dharma Initiative member lying in the mass grave.
Danielle also carries the Remington 700 BDL model. In a flashback, Eddie Colburn (Justin Chatwin) is seen hunting with a Remington 700 in "Further Instructions" (S3E03).
A Mosin-Nagant M91/30 rifle is used by Mikhail (Andrew Divoff) in Season 3's "Enter 77" (S3E11). Mikhail's M91/30 rifle would later be used by Sayid (Naveen Andrews) in a number of episodes after "Enter 77".
The SKS rifle is used by Sayid in raiding the Others camp in one episode. The SKS rifle Sayid used was a Chinese SKS (note the bayonet). In "Enter 77" (S3E11), Mikhail also uses an SKS to shoot at Desmond as he sits in a boat. One of the Jacob followers fires a SKS at the smoke monster but is quickly killed. Kate carried one on an "A-Team" mission to the Flame station and then to the Barracks in an attempt to rescue Jack.
The M1 Carbine is another one of the common weapons used on the island. Frequently carried by the "Others" as well as the survivors. The characters seen carrying the weapon include Desmond in "Par Avion", Juliet, who fires one at attackers in a boat.
Error creating thumbnail: File missingWorld War II Era M1 Carbine, with Dark Walnut Stock, 'L' peep sight and no bayonet lug - correct for most of WWII, shown with khaki sling and oiler and a period twin magazine pouch for buttstock