What is this No4 Medallion?

[scoobsean]

The attached photo is of the father of a friend, who served in WW1. He is far right, front row - the Lance Corporal with the Marksman badge. Also shown is a medallion which has 2 crossed No4 rifles on it. Anyone know what this is? The father also served in the Home Guard in WW2, so maybe it was from his time in the Home Guard?

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