Bandit Captain Multiattack

I just ran "Darkness in Nulb" last night and one player gave feedback about how I ran Bandit Captain, specifically multiattack with pistol

This is the stat block in question from the Bandit Captain
Pistol. Ranged Attack Roll: +5, range 30/90 ft. Hit: 8 (1d10 + 3) Piercing damage.

Considering two attacks, with no penalty to reload, pistols have slightly higher damage than longbow. The question from the player is, "Shouldn't there be a restriction on reloading or firing a ranged 1d10 weapon, more than once per round?"

As a DM and player myself, I was able to suspend my disbelief of muskets and funnels with gunpowder for the magic of an equivalent damage expression Eldritch Blast

Compared to Xvart Warlock of Raxivort, yes that's 5.0E but the damage expression is very close to the same, two attacks with multiattack, melee or ranged or any combination of the two and the ranged attack is 1d10+2

This might not even be the correct thread for LoG combat stats questions. I guess I was alright about taking down two players in one round with high rolls on Pistol. What do others think about this?

rules are what rules say.

Rules for players say Pistols have the "Loading" property.

Rules for Bandit Captain say 2 attacks Scimitar or Pistol, any combination.

It's a tad "unfair" compared to what the players can do, but, it follows the rules.

Clearly the Bandit Captain class has a special ability.

Note, in the real world, Pirates would actually carry multiple pistols and fire one, drop it, fire another, repeat. I bet they were trying to replicate that.

Monsters don’t have to follow the same rules as PCs. And they still lose almost every time. Suckers.

D&D is quite simulationist in its approach, but not precisely so. 

The way to think about this is that the Bandit Captain, in 5.5e, is balance around it having a ranged attack that does 1d10+3, up to twice a round. It's flavoured as a pistol to make it feel like a bandit (I'd say more a pirate, but whatever), but really it's a set of numbers designed to give a good experience when fought in the appropriate circumstances.

Monsters/NPCs don't have to follow the same rules as PCs. Pistols for PCs have a set of rules that makes it feel like your character is using a pistol while balancing it against other weapons so there is not a "correct" weapon to use. The Bandit Captain has rules that makes it feel like you're fighting a bandit captain while balancing it against other monsters and keeping it easy to run for the DM. These are different dynamics and so results in different rules.

Incidentally, this is why you should think twice before allowing players to loot weapons off of NPCs unless you're willing to do the work to reconfigure them to be appropriate for a PC. What works for an NPC may not work well (or too well) for a PC.