So you've probably started wondering what these guns are based on- let me take that off you and just spoil my references.

Rk-5: SG552, FN FNC, Ak-5
Bulldog: IWI Tavor, AUG, HK416
2011: Browning HP, P226, MAS1935
Klauk pistols: Glock 18/19
RK-12: Imbel IA2, FAL, SG552
SCARAB-H: Airsoft Bullpup conversion kit for a SCAR-H
Jaeger 762: Generic hunting rifles
Spectre: SAKO TRG, Arctic Warfare, Beretta Victrix
Gewalt 500: PMG Hecate, AI AW 50
Poltergeist: SRS A1, GM-6 Gèpard
ATD-80: Panzerfaust 3, SMAW
Tommahawk: Carl-Gustav MAAWS, various versions
Baker M12: Ithaca M37
Hunter ICW: Baker M12 with airsoft accesories
Keller 45: HK UMP, MP5
ReyTac PDW: AR-57, FN P90, Hera arms AR kit
AME556: CETME AMELI
Adder: Knight LMG, PKP Pecheneg
Victorious 1879: Nagant Revolver, Victory Model
Matt-Eber: Mateba Unica 6, S&W 500 Magnum
Rapida 9mm: Various cold war SMGs, most notably IWI Uzi

Roadmap

-Expansion packs:

-Semiautomatics
-Berthold Model 82 and Hellcat 6 AMRs
-Sergei 12G and Sledgehammer shotguns
-Faluchi 330 and SCARAB SSR DMRs

-Firepower
-Warhammer and Talon Guided Missiles
-AME 762 and Adder Surpressive GPMGs
-Martins 40mm and IGP Project Grenade launchers

-Halcon-Crisis expansion
-SAMAF and F36 assault rifles
-AME 762 Hawk and F/M 240 GPMGs
-AW Magnus and Gewalt 338 sniper rifles

-Magpie/Kestrel
-???
-RK-47