Description:

The M192 Alpha 3 (A3) HGMC is a upgrade from the M192A2 HGMC, the new howitzer uses the 155mm M795 High Explosive shell, the M192A3 HGMC has a new gun with degraded range because a lot of M192A2 crews complained about the gun on the M192A2, sometimes it slightly bends, and some had to go to the military repair shop because of the long gun.

Survivability:

Front
Hull: 100mm
Turret: 30-50mm
Sides
Hull: 47mm
Turret: 25mm
Rear
Hull: 15mm
Turret: 15mm

Pros and Cons:

Pros:
Can Block 30mm
High Mobility
Can effectively one shot tanks with HE-VT

Cons:
Only -3° of gun depression
Cannot block 30mm from sides and rear
Degraded range of the gun

(Reference from: War Thunder)