I'm considering getting a Argent peacemaker, but I don't know if it would be a good gun to get, does anyone have any advice?
Argent peacemaker
The DPS isnt that far away from a alchelmer (Nova driver) and has better range and how battlegrinder says is a lot more easy to use since you dont need to aim the ricochets and the damage from alchelmers is 90% based on it if you cant aim the ricochet you just are using a crappier valiance.
Boths are great weapons anyway.
Also i suggest you to wait for the gunners update.
The primary consideration in choosing a handgun is usually its damage type (as is the case with swords). Do you already have an elemental gun? What other weapons do you have, and would they be well-complemented by an elemental gun?
Another consideration is play style. As others have said here, Argent and Sentenza (and now Carbine I guess) are easy to use, and deliver decent damage. But alchemers are harder to use (which is a negative, unless you enjoy playing well for its own sake, in which case it becomes a big positive) and do more damage in the hands of an expert (due to the ricochets).
As the others have said here, you might want to wait for the big gunner update, before making any big decisions.
Insane damage against undead which makes it a great backup weapon on FSC.
Against any other enemies than Undead or Constructs it's pretty much useless.
I suggest you to get both but first the Nova Driver. It's Charge Attack is one of the best if you can aim right. You can ONE HIT enemies with the charge.
The AP is a nice gun, but it's generally considered inferior to the Alchemer line for damage dealing. However, the AP is much easier to use and is an undead wrecking machine (I have one, and it makes dealing with Kats so much easier). If you're a gunner, I'd suggest you get an Alchemer and learn how to use it. If you're anything else, the AP is a fine choice.