The holster in the pictures is a 6280, like this:
http://www.safariland.com/products.asp?id=148
I've got a couple of these, one for an HK one for a Glock. They are Level II, holsters not Level III. Good for duty pistol shooting, as they are fast and very simple to use. You will never look at a holster with snaps again.
6004 is a "tactical" (thigh) holster. Every 6### holster, whether duty or tactical, uses the SLS (Self Locking System) system, a rotating hood that pushes forward with your thumb. I guess that is what I am saying when I say "these" holsters... SLS holsters.
Raptor holsters are 6### models as well, but they use a kind of modular construction (have a look at the link). They also employ the SLS system.
http://www.safariland.com/duty/raptor.asp
As the poster above notes, the ALS (Automatic Locking System) holsters are the new breed of Safariland gear.
http://www.safariland.com/duty/als.asp
Definitely go for one of these if you have the cash and you can find one you like. The 6304 and 6305 models are probably what you want to look at. They are the replacements for the 6004 and 6005 models (the "5" models have a quick release leg harness).
The Cops Plus entry for 6304 is here:
http://www.copsplus.com/prodnum6243.php
And 6305 here:
http://www.copsplus.com/prodnum6244.php
The price is like $20 more U.S.
Dave's surplus has 6004 holsters on their website for $184.99
http://www.davesarmysurplus.com/index.php?cPath=50_51_157
That is not too bad a deal. Getting one that fits your gun and your light though... that is a different story.