In "SO" (S3E01), one of the "fine dark fellows" points a Beretta Px4 Storm on SAMCRO's crew.
Glock 17
Harry "Opie" Winston (Ryan Hurst) continues to carry a Glock 17 as his main sidearm. Several SAMCRO members are seen using the Glock 17, including Jax (Charlie Hunnam). Donny (Joel Tobeck) enters in Maureen's house with a suppressed Glock 17 in "Turas" (S3E09). Fiona Larkin (Bellina Logan) takes Donny's Glock and uses it to threaten Jimmy in the same episode.
Glock 26
Happy Lowman (David Labrava) uses a suppressed Glock 26 to shoot out a rear tire of the Mayan's van in "The Push" (S3E06).
Heckler & Koch USP
Clarence "Clay" Morrow (Ron Perlman) carries the Heckler & Koch USP as his main sidearm. Jimmy O'Phelan (Titus Welliver) is seen holding a suppressed H&K USP when confronting Fiona in "Turas" (S3E09). Gemma takes out Jimmy's USP and then aims it to him.
Jericho 941
Keith McGee (Andy McPhee) uses a two tone Jericho 941 to threaten an Irish policeman in "Lochan Mór" (S3E08).
Jericho 941 Compact
In "SO" (S3E01), a gang member is seen firing a Jericho 941 Compact at Jax while escaping in the car.
SIG-Sauer P220
Marcus Alvarez (Emilio Rivera) uses a SIG-Sauer P220 to threaten Hector Salazar in "Widening Gyre" (S3E07). In the same episode, Unser (Dayton Callie) tries to stop Gemma with his SIG-Sauer P220 when she attempts to escape from the hospital.
Hector Salazar (Jose Pablo Cantillo) uses a Taurus PT92 as his sidearm during "Bainne" (S3E11). Hector uses the Taurus when he takes Tara and Jacob Hale hostage in "June Wedding" (S3E12). Both Jax and Tara also handle the Taurus in the same episode.
Ruger P89
Alex 'Tig' Trager (Kim Coates) continues to carry a Ruger P89 as his sidearm in this season. After disarming Amelía of her Remington 700, Gemma uses a Ruger P89 to threaten her in "Oiled" (S3E02). Tig lends his Ruger to Shepard (Leo Fitzpatrick) to protect Lumpy's gym in "lochan Mór" (S3E08).
Ruger KP95
Tig is seen firing what appears to be a Ruger KP95 at the Russians in Season 3's finale "NS" (S3E13).
Trinity Ashby (Zoe Boyle) grabs a Walther PPK hidden in the cash register when she hears the screams from the apartment above in "Turas" (S3E09).
Revolvers
Colt SF-VI/DS-II
Gemma takes a Colt SF-VI/DS-II from a drawer in the garage and uses it when she talks with Stahl in "June Wedding" (S3E12).
Ruger GP100
After being dismissed from service, Unser (Dayton Callie) takes a Ruger GP100 from his drawer and carries it during the end of Season 3's finale "NS" (S3E13).
Taurus Model 605
In "Turas" (S3E09), Salazar's old lady, Luisa (Tara Macken), draws a Taurus Model 605 on Tara and Margaret when Salazar force both women to enter in the car. Tara Knowles (Maggie Siff) is briefly seen using the Luisa's Taurus in "Bainne" (S3E11).
Head Red is seen using a Remington 870 in "Home" (S3E04). Diana Alvares (Michelle Diaz) aims her Remington 870 fitted with a pistol grip at the Sons when they talk with Marcus in "Fírinne" (S3E10).
Winchester Model 1912
In "SO" (S3E01), a Niner is seen armed with a Winchester Model 1912 when the Sons enter his neighborhood.
Mossberg 500 Cruiser
Two Mossberg 500 Cruisers are seen in a bag of guns carried by the Sons in Season 3's finale "NS" (S3E13).
Rifles
AKM
Hector Salazar (Jose Pablo Cantillo) uses an AKM to destroy Lumpy's gym, and later uses the butt of the rifle to hit Lumpy in "Lochán Mór" (S3E08).
Heckler & Koch G3A3
The Irish police are armed with Heckler & Koch G3A3 rifles when they stop the Sons at the roadblock in "Lochan Mór" (S3E08).
In "Caregiver" (S3E03), Chibs (Tommy Flanagan) is briefly seen holding a Heckler & Koch MP5K given to him by a Chinese triad in the restaurant. Several of the O'Phelan henchmen are seen carrying Heckler & Koch MP5Ks fitted with extended barrels in "Fírinne" (S3E10).
Intratec TEC-9
Two Intratec TEC-9s can be seen when the Sons load up the cash and their guns at the clubhouse in "NS" (S3E13).
MAC-10
A MAC-10 can be seen when the Sons load up the cash and their guns at the clubhouse in "NS" (S3E13). Opie (Ryan Hurst) also fires one in the same episode.
Machine Guns
M249 Paratrooper SAW
Several M249 Paratrooper SAWs are seen in crates when the Sons arrive at the barn to load the guns onto a truck and transport it in "Turas" (S3E09).
Other
SAMCRO's Bags of Guns
At the end of season 3 "NS" (S3E13), several submachine guns, shotguns and pistols are laid out on the pool table by SAMCRO, which are then are put in bags, ready to make the exchange with the Russians. Some of these guns are two Mossberg 500 Cruisers, two KG-9s, a MAC-10, a Taurus PT92 and a Smith & Wesson 639.