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As per the topic, both the wiki and game list the 120mm as The L1A1, this is the designation of the 7.62 SLR personal weapon phased out with the introduction of the SA80,  the correct designation for the 120 mm, is simply  L1 120mm.

nice find or whatever this guy deserve something

The designation is just fine, both the L1A1 and the L1A2 gun saw service in the Conqueror Mk. I and Conqueror Mk. II.

Either way, if you want to report any game bug you need to file a support ticket.