[Gunner313]

This Shotgun is used in Terminator 3. It looks similar to a Remington 870 with a military bayonet attachment. But the shotgun in the pictures has a unique sling attachment, an odd forearm, no bayonet lug and the heat shield looks like a factory Mossbergs.

http://www.imfdb.org/images/4/4a/T3_Shotgun-1-.jpg

http://img.photobucket.com/albums/v231/Gunner313/Joels%20Weapons/Terminator_3_002-1-1.jpg?t=1187653852

Here is a picture of a military Remington 870 with bayonet attachment, for comparison sake.
http://www.fas.org/man/dod-101/sys/land/12-gauge-dvic519.jpg

[PTK]

It looks like an 870 with parts added to make it look meaner.

[Cuda71]

According to IMFDB, you are correct:

http://www.imfdb.org/index.php?title=Terminator_3:_Rise_of_the_Machines

[Gunner313]

I help create pages at Imfdb.org, Terminator 3 is a page I have done alot of work on. I just wanted to be sure that the shotgun was a 870 as I have never seen a 870 that looks like the one used in the movie. If it is a 870 are the unique parts, factory or custom?

;)

[Cuda71]

I'm no expert, but I've been doing some research since I plan to buy an 870 soon. Remington doesn’t make one like that from the factory. Most of the parts (such as the barrel shroud and fore-end) are custom and readily available. I’ve never seen a fore-end exactly like that one, so it probably was scratch build for the movie.

My guess is Arnold's 870 was customized based on a police model like this one:

http://beaniam.com/guns/m870_dones.jpg

[ArmedBear]

Note that movie prop rental houses do a lot of work on firearms.

These are the guns from Pale Rider:
http://www.alliancelink.com/srrs/00image/gallery/clint01.jpg

http://www.scorrs.org/

Cartridge conversions of BP replicas were done by Stembridge Gun Rental in Glendale, CA. http://www.stembridge.us/2004/10/25/stembridge-gun-rental/ I'm presuming that the trigger conversion on the pocket revolver was custom, as well, as the replicas I know about look like this:

http://www.cabelas.com/cabelas/en/content/Item/21/53/62/i215362sn02.jpg

Other examples? The chrome Stars in Pulp Fiction, the guns of Firefly, etc.

This looks like an 870 that's been doctored up to have a look in keeping with the Terminator costume.