V1 Gearbox :
(Famas)

Suitable for : machine gun.

.

V2 Gearbox :
(MP5, G3, M4 and derivate)

Suitable for : small machine gun.

V2 Next gen :

SR-25 variant :

ICS variant :

Masada variant :

.

V3 Gearbox :
(AK, AUG, G36, SIG, MP5K)

Suitable for : small machine gun.

V4 Gearbox :
(PSG Marui)

Suitable for : small machine gun.

.

V5 Gearbox :
(UZI Marui)

Suitable for : machine gun, small machine gun, rifle.

.

V6 Gearbox : 
(P90, Thompson)

Suitable for : machine gun, small machine gun.

Thompson M1/M1928 variant :

.

V7 Gearbox :
(M14, Sten)

Suitable for : machine gun, small machine gun, rifle.

G&G variant :

AGM Sten variant :

.

V8 Gearbox :
(Type 89)

Suitable for : small machine gun.

.

MP40 Gearbox :

Suitable for : machine gun, small machine gun, rifle.

.

M3A1 Gearbox :

Suitable for : machine gun, small machine gun, rifle.

.

PPSH Gearbox :

Suitable for : machine gun, small machine gun, rifle.

.

SVD Gearbox :

Suitable for : machine gun, small machine gun, rifle.

Real Sword SVD variant :