Many Bandit minions should be updated. Raiders and Gunslingers aren't worth 8ss for now.
Regarding Bandidos.
They could use built-in plus on their guns like the other bandits.
Remove Knife and give them Gunslinger. Move Maim trigger to the Revolver attack.
At Gunpoint is an odd action, indeed. It's not projectile, so you can't use it with other ablities. It's only 8" so you need to go into the fray with a squishy minion. And even in a perfect situation you need a seven+ card for it to succeed. I don't remember declaring it even with Dead Outlaws, which is easier, can be used on Guilty and has triggers, even a built-in one.
They don't have a bonus action - you can attach Wanted Criminal for Free Loot. But it would be good to have another BA on the card.
They don't have any protection save for the non-built-in trigger. Even Bulletproof would be good.
Just for comparison, other available 5ss models: Catalan Rifleman, Freikorpsmann, Necropunk, Big Jake, Guilty, Obedient Wretch. There's also Wrastler, which is another rare hire.