So, a Target is a (usually) stationary object with concentric circles on it. The smaller the circle, the higher the score. Therefore, using Effect (Table on pg. 59 / pg. 61 in the Update), the Target would look like this:
0 - Outer Circle (Marginal Success)
1+ - Inner Circle (Average Success)
6+ - Bullseye (Exceptional Success)
Joe Traveller was a Scout and only learned a little about Gun Combat. So, if Joe has Gun Combat-0 and a DEX DM of 0, he can only Aim and use LaserSights for a Bonus to Attack. He decides to Aim for one whole Round of 3 Minor Actions, and Aim for his Minor Action in his second Round, giving him a +4 Aiming Bonus. Add the LaserSights Bonus of +1 and he adds a +5 to his roll. He needs an Average check of 8+. The Target is 10 meters away - Standard Range for a Gauss Pistol.
He rolls a 5 + 2 for 7 and adds the +5 Bonus for a 12!
Joe hits the Inner Circle on the Target with an Effect of 4.
He Aims again, and after Aiming for one Minor Action in the second Round, fires again with a +5 Bonus.
He rolls a 4 +1 for a 5 and adds the +5 Bonus for 10, hitting the Inner Circle again with an Effect of 2.
So now Mary Traveller walks up to take a turn. She was in the Imperial Army. She has Gun Combat-2 and a DEX DM of +1. Using a Gauss Pistol with LaserSights like Joe, she Aims just like Joe did.
She rolls 2 + 2 for 4, adds Gun Combat-2, DEX DM +1 for 7, and the Aiming and LaserSights Bonus of +5 for a total of 12, hitting the Inner Circle with an Effect of 4.
She Aims again, the same as before.
She rolls 2 +4 for 6, adds Gun Combat-2 and DEX DM of +1 for 9, and the Aiming and LaserSights DM of +5 for a total of 14, hitting the Bullseye! with an Effect of 6!
You can see what's important for Firing a Ranged Weapon:
Gun Combat skill
High DEX score
Aiming
LaserSights
And if the Target is at Short Range, you even get another +1.
All of those DMs and Bonuses add up.
Try the Target out with your own characters. Keep one on your ship for downtime.
You could use this for throwing Darts in a Starport Bar, too. Swap out Gun Combat for whatever skill Darts falls under (I think it's Athletics) - or just a DEX check.
Combat is on pg. 73 in the Updated Core Rulebook.
If you want, you can change the placement of the target at Short Range or Long Range or try other variations from the Combat chapter.