In SpecOps87 defend, most of the firearms on his list can be rented at ranges stateside albeit they charge you quite a bit for full autos. The only ones I have not seen at any ranges (and I've been to quite a number) are the FNs and the SIGs. I would love to get my hands on any of the 55x series. I know some police departments are changing over to those.
Anyway, other than the stuff the good ol' SAF had us shooting, I haven't gotten the chance to try my hands on much other than the following:
Barrett .50
Rem 700 BDL
Rem 1100 Competition Master
M1A Socom 16 (helluva shooter this)
probably a dozen or so variation of the M16/AR15 platform
couple of dozen different 1911 style pistols
a bunch of Combat Tupperware incl Glocks and XDs
The following are some of the stuff we have in house:
Bushmaster Modular Carbine
Rem 870 Police (modified)
Verona O/U
S&W 952 (Performance Center custom)
SIG P226ST (factory custom)
and a couple of frames, slides and parts to create that Franken-gun of our dreams

What's on my wish list? Nothing fancy.......
Just a Barrett M468 6.8 Remington SPC
If I'm nice, I hope Santa (spelled W-I-F-E) will get me one for Xmas
