You are adept at using guns effectively.

• You gain proficiency with Firearms.
• If you roll a misfire on an attack with a firearm, you can use your reaction to roll a d20. If the number rolled is higher than the weapon’s misfire score, the firearm does not misfire. You cannot use this feature of this feat again until you complete a short or long rest.
• When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a loaded firearm with the light property you are holding.

 

In my campaign on friday I'm running a little fair of different classes coming together for learning. During this time my plays are going to meet coaches and teachers that will help them use their classes and abilities to their full potential. (My players said they feel they don't fully understand their characters especially in combat so i thought this would be a fun narrative way to help them). 

With this in mind i have a gunslinger and i dont understand the last point of Firearm Specialist. 

• When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a loaded firearm with the light property you are holding.

1) Is a firearm a "one-handed weapon" ?
2) Is a pepperbox a "light" weapon?
3) Does this mean he could shoot his gun and as a bonus action shoot again because the pepperbox still has ammo
4) Could he do this every turn as only bullet 2 says once per rest?

(Disclaimer i understand gunslinger is unofficial material, critical role, homebrew content and all that. i just need to know the answer to those 4 questions before Friday. thank you all you helpful people)

1) Depends on the the firearm. Per the feat, the firearm needs to have the light property (which implies it is one handed).  There may be firearms that have the heavy and two handed property. You need to check on the type of firearm the character is using and verify it meets the requirements of the feat. 
2) It doesn't appear to be.  The Palm Pistol has the light property.
3) No.  You are allowed to make one attack.  What it does mean, if the firearm can have two bullets then you can use this feature to attack on two separate rounds before having to reload the firearm.
4) Not every turn.  The character can only do it when they are holding a loaded firearm with the light property.  If the firearm is not loaded or lacks the light property, then they cannot use the feature.  With that said, you are correct that there is no limit to the number of times per rest period.  As long as the character meets the requirement for the firearm and one-handed weapon then the feature can be used. 

I couldn't find anywhere a list that included the light property but you saying the palm pistol helped.

So here is the answer if anyone reads it in the future. 

1) Yes a firearm can be one handed unless listed as 2 handed. It doesn't have to be a melee weapon or one hand crossbow. 

2) No a Pepperbox is not a light weapon. At time of posting there is only one "light" firearm and its the Palm Pistol.

3) No because the pepperbox isn't a light weapon. But, you could do this if a light weapon with more than 1 ammo or any light gun and you have the Gunner feat. This meets the Attack and Light conditions.

4) Yes they could do this every turn. as this bullet is not listed as once per rest. 

TLDR my player cant do it because the pepperbox doesn't meet the "light" property.