Assembling the M4 81mm Armoured Mortar Platoon (UBX78)
How to assemble your M4 81mm Armoured Mortar Platoon
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Step 11. Attach the MG to the windshield.
Note that there are two different MGs. The 50. Cal is the longer of the two and used in Late War whilte the 30. Cal is the shorter and used in Mid War.