The following weapons were used in the film The Island:
Albert Laurent (Djimon Hounsou), the leader of the mercenary team hired to track down Lincoln and Jordan, carries what appears to be a SIG-Sauer P229S as his sidearm. He most notably uses it in the confrontation with Tom Lincoln and Lincoln Six Echo (both played by Ewan McGregor). One is also (possibly) used by the Blackhawk gunman when confronting James 'Mac' McCord (Steve Buscemi).
A two-tone Glock 17 is carried by LAPD officers as well as one of Laurent's mercenaries.
A stainless steel Makarov PM can be seen being used by Tom Lincoln and by Lincoln Six Echo during their altercation following the car chase.
While waiting for Tom Lincoln and Lincoln Six Echo to return to Tom Lincoln's home, Jordan Two Delta (Scarlett Johansson) discovers a gun case holding a two-tone NAA Guardian and a missing Makarov PM. She then pulls the Guardian on Lincoln Six Echo when he returns forcing him to prove that he's Lincoln Six Echo and not Tom Lincoln. Jordan Two Delta later uses the pistol back at the facility after having been captured.
One of Albert Laurent's men is seen armed with an M4A1 with an ACOG scope and Magpul stock.
Troy Industries M14 SOPMOD
One of Albert Laurent's men is seen firing an M14 SOPMOD outside the building where Jordan hangs for dear life.
Heckler & Koch G36C
One of Albert Laurent's men is seen with a modified Heckler & Koch G36 during the downtown shootout.
Franchi SPAS 12
One of the Island guards is seen holding a Franchi SPAS-12 shotgun when he's shot by Laurent.
Remington Model 700 rifle with Choate Ultimate Target/Sniper rifle stock
Heckler & Koch SL8
One of the Laurent's mercenaries is seen using a Heckler & Koch SL8 fitted with a Leupold CQ/T scope from the helicopter during the shootout at the office building.
The 'Black Wasp' airbikes used by Laurent's men in Los Angeles can be seen fitted with short barreled M249 SAWs as their primary armament.