When they shoot it takes a long time (nearly a second) to "hit" the target and when they fail a great column of dust arises from the ground (like a mortar attack).
It loooks like you were firing a slooooow bullet that explodes like an artillery shell which is something that definetly a AT rifle doesn´t do.
Suggestion: make it the same as a tank gun shoot. A quick "bang!" and small explosion if target not hit.

