There is one shot in Star Wars: A New Hope where one Tusken Raider, from a high cliff on a rock mesa, aims at Luke's speeder that zips through a canyon below; then, a second Tusken Raider touches the sniper from behind and, after a brief argument in their barbaric tongue, seems to get in the final word and the nomads scurry over the rocky terrain.
The fact that Tusken Riders shoot down a fast racer during the Boonta Eve Classic in 32 BBY demonstrated that these sand people are skilled marksmen, thus, why, having a good overlooking from a high position, they didn't shoot down Luke's X-34 with their long ominous cycler rifle (slugthrower type)?
It is interesting to note what the Star Wars - A New Hope 4th revised script tells about the shot.
One of the marginally human creatures raises a long ominous slugthrowers and points it at the speeder but the second creature grabs the gun before it can be fired.
