This article is from the The Terminator FAQ, by Karsten A. Loepelmann kloepel@connect.ab.ca with numerous contributions by others.
When Sarah attempts to kill Dyson, she uses a CAR-15 (aka XM177L2), which
looks similar to an M16A2 carbine. The sound suppresser on the guns is a
Sionics model, first designed in the 1960s, and used by the US on M-16s in
Vietnam.
When Sarah enters Dyson's house, she is using a .45 longslide automatic,
which
(except for the laser sighting) is the same weapon the original Terminator
used to assassinate the various Sarah Connors. The pistol's Aimpoint laser
sight may represent the advance of technology, which is itself indicative of
the future.
The Terminator's shotgun appears to be a model 1887 Winchester level-action
shotgun (see "Guns & Ammo", 12/91, p.18). Sarah's shotgun looks like a
Remington 870. The shotgun in T1 is a Franchi SPAS-12.
Some other weapons include: Heckler & Koch MP-5s, and an M-79 grenade
launcher. For more info, see the T2 Movie Gun Mishaps page:
http://www.teleport.com/~dputzolu/MGM-T2.html
 
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