Anti Tank Rifles is what there were originally called in WW1 to post WW2 as that's what they were make to kill but as tanks armor progressed these types of rifles became useless against tanks & thus were renamed anti material rifles & relegated to sniper, anti light skinned vehicles, & anti material (entrenched enemy positions).
Today they are mostly used as very long range sniper support.
It would still be nice if you could post a preview of it in-hand because the in-hand image might be tottaly different to the render, where you can make it look way beter than what it is.