Calico M950:
http://www.military-today.com/firearms/calico_m950.jpg
Possibly would use the P90 Anims, although I'm not sure how it'll look, I'm hoping similar to the Chang-Feng 06 SMG
Automag Pistol:
https://static1.squarespace.com/static/56311321e4b08236a1ddbbf7/t/587b8a986a4963fff6d13a48/1484491417595/AutoMag44Classic.jpg?format=1000w
Possibly could use the Desert Eagle anims, but the hands may clip through the gun or not touch it at all, the Parabellum might work too though.
PP90M1:
http://www.imfdb.org/images/thumb/b/bc/Pp90m1-2.jpg/350px-Pp90m1-2.jpg
Bizon Anims
IWI Tavor SAR:
http://cdn1.athlonoutdoors.com/wp-content/uploads/sites/8/2015/06/bullpup-swja15-iwi-682x383.1431968400.png
TKB 076:
https://qph.ec.quoracdn.net/main-qimg-c77024b65e13f76cc99225c2b00d9815-c
or https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQgdI3jUmDxXceeV_jD54wvH3hobSBi3jqzrfifxJXn0mb25Iki
I'm not sure if this one will work with current anims, the magazine might be positioned too far back
Kel-Tec RFB:
https://cdn3.volusion.com/ftmar.dfprg/v/vspfiles/photos/RFB18BLK-2.jpg?1435390667
Possibly could be a sniper rifle/DMR, and use the WA-2000 animations
Walther P99:
http://www.imfdb.org/images/thumb/7/70/WaltherP99_twotoneA.jpg/400px-WaltherP99_twotoneA.jpg
Colt CM901:
http://www.imfdb.org/images/thumb/d/d4/CM901.jpg/800px-CM901.jpg
Most likely would be an AR but might make a good DMR sniper rifle as well
Barrett M107:
http://www.imfdb.org/images/thumb/a/a2/Berrett_M107.jpg/400px-Berrett_M107.jpg
HK Mg4:
http://www.imfdb.org/images/thumb/1/1b/H%26KMG4.jpg/500px-H%26KMG4.jpg
A few too that I'm not sure are possible with given animations, considering the bizarre magazine placement:
HK G11:
https://static.giantbomb.com/uploads/scale_small/1/13313/1169189-g11_scope.jpg
MP412 REX:
http://www.imfdb.org/images/thumb/c/c7/Mp-412-1.jpg/400px-Mp-412-1.jpg
Now I've never done any requests like this before so if there is any proper formatting/guidelines I missed, please let me know in the comments.
Figured as much with the G11, given the awkward magazine placement and the animations would probably show it being torn out the side of the gun. As for the REX though, it's a breakaway revolver compared to a traditional cylinder one, which I don't think there are any existing animations for.