This weapon tackles two things at once: how you need to venture into very hostile environments just to start gunner playthroughs, and how there aren't enough handguns in terraria. Weak stats, crafted just with some iron/lead bars and wood at an anvil.
Uh, no, this probably wouldn't work because you'd then have an easy Minishark or even a Flintlock Gun once you craft it, unless it doesn't summon the Arms Merchant: See the idea.
Old Hand Cannon (what OP suggests)
"Straight from the age of kings and conquerors!"
Attack: 11
Firing Rate: 36
Critical Chance: 4%
Knockback: Weak
No Auto-Fire
Velocity: 30 mph, straight
Sell Price: 6 Silver Coins (Buy: 30 silver)
Crafting Recipe: 10 Iron/Lead Bars, 4 Wood
Quirk: Can't summon Arms Merchant. (treated as misc. ranged weapon)
Conquista (an upgrade)
"Best wielded on horseback!"
Attack: 23
Firing Rate: 32
Critical Chance: 4%
Knockback: Weak
No Auto-Fire
Velocity: 40 mph, straight
Sell Price: 20 Silver Coins (buy: 1 Gold)
Crafting Recipe: 5 Copper/Tin Bars, 2 Topaz, 7 Gold/Platinum Bars, 1 Old Hand Cannon
Quirk: Riding a mount increases its base attack by 10. Can't summon Arms Merchant. (treated as misc. ranged weapon)
Makeshift Bullets
"Too big for a normal gun..."
Attack: 5
Critical Chance: 6%
Knockback: Strong
Buy Price: 5 Copper Coins
Crafting Recipe: 1 Copper Bar, 1 Iron Bar (Makes 50) OR 1 Tin Bar, 1 Iron Bar (Makes 45)
Quirk: Can only be fired by Hand Cannon weapons. Splinters into an extra projectile after hitting the enemy. That extra projectile will only deal 25% of original damage to the enemy (rounded to the nearest number). Does not splinter on hitting surface.
Intention: A Hand Cannon alternative to a Crystal Bullet, except weak.
Leaded Bullets
"Definitely unsafe to use..."
Attack: 6
Critical Chance: 25%
Knockback: Strong
Buy Price: 7 Copper Coins
Crafting Recipe: 1 Copper Bar, 1 Lead Bar (Makes 40) OR 1 Tin Bar, 1 Lead Bar (Makes 45)
Quirk: The bullet can cause the gun to misfire wildly, has 80% chance to aim up or down from the original track. This chance lowers down to 40% when using Hand Cannons.
Intention: A high-critical rate bullet that makes all guns fire like a Chain Gun. Also a nod to the accuracy of Hand Cannoneer.