As fan of the fire arms i think that will be pimp if we had the chance to have some... let's say... "silly weapons" in game, that the only mod that you can attach to 'em is a suppressor or a V grip; some old WWII weapons, 60s, 70s weapons or just rare weaponsi.e:
Pistols like:
- AKBS TTK.
- the John Dillinger's M1911 (he made a mod to the trigger group so it was automatic, used extended magazines of 14rnds, placed a M1A1 Thonson front grip and it's muzzle break).
- Luger P08.
- Luger P08 (the very rare version that the nazis had with an integrated light, placed in front the trigger's ring).
- Luger P08 Artillery.
- Mauser C96.
- Walther P38.
- Walther P38K.
- Nambu T14.
- TT-34 Tokarev.
- TT-34 Kingsmen's Pistol.
- OTs-38.
- Star Super B.
- H&K M7M13.
- H&K VP70.
- Hi-Point C9.
- Claridge Hi-Tech S9.
- PL-14 Lebedev.
-GSH-18.
SMGs like:
- CBJ AK900.
- CETME C2.
- Star Z62.
- Star Z70.
- Star Z84.
- CF-05 Chang Feng.
- CS-LS 5.
- Famae SAF.
- FMG-9 and carry it as a closed briefcase in the back.
- Jatimatic GG95.
- M1A Thomson 1928.
- M1A1 Thomson.
- M3A1 Grease Gun.
- Mat-49.
- MPA-930T.
- PPA-K TiRecks.
- PPS-43.
- PPSH-41.
- QBW-05.
- Spectre M4.
- Spitfire Mini Commando 45.
- Steyr TMP.
- UZI Kommando.
- Walther MPL.
Shotguns like:
- FN Browning Auto 5.
- Monolith Arms P-12.
- NIB Stoeger 12ga.
- QBS-09.
- Saiga KS-23.
- SAP 6.
- SRM Arms Model 1216.
- UTS-15.
- Winchester M97.
Assault rifles like:
- Bofors AK5.
- Bofors AK5C.
- Bofors AK5D.
- Armalite AR18.
- Beretta AR70.
- CETME CV.
- CETME L.
- CETME LV.
- CETME LC.
- CETME LCV.
- Daewoo K2.
- FNC.
- Howa Type-89.
- Jantar M.
- Kalashnikov AS-1.
- Kalashnikov AS-2.
- L1A1 SLR.
- RK-95.
- Ruger AC 556.
- SR-3 Vikhr.
- VHS-2.
- VHS-K2.
- Pink XM-8.
Battle rifles and carbines like:
- BM-59.
- CETME FR8.
- Fedorov Avtomat.
- Ohio Ordnance Works HCAR.
- M1M2 Carbine.
- M14K.
- SVT-40.
LMGs or GPMGs like:
- 6P62 HMG.
- CETME Ameli.
- H&K 23E.
- M240L.
- MG3 KWS.
Some of those weapons will make the weapons fanatics very happy, aside of surprise many others players that may not know some models; i love some of the good ol' WWII weapons, that may give a look of the player as someone that came right from a Ohio's shelter with the grandpa's still and found the party going will in NY.
I'd forget to add a shotgun to that list.
The Mossberg 500-590 Bullpup:
And maybe also the CAWS:
But the CAWS was a project that didn't sow the light as there was problems with the concept, mainly the ammo that couldn't be standard and also that it had a complex field strip and that it was too vulnerable to dust, debris and mud for a combat shotgun in comparison with the Winchester M97 Thrench Gun, that has been with us since the WWI to the Gulf War.