Medical Gun

2 weapons: +10 Range
3 weapons: +20 Range
4 weapons: +30 Range
5 weapons: +40 Range
6 or more: +50 Range

RangedGun MedicalTiers I–IV

Unlock: Available from the start
Starting weapon for: 11 characters

Community builds that use it

DoctorStay on Medical weapons, the only ones that keep the attack-speed bonus: Scissors upgrading to Circular Saw with Melee Damage, or Medical Gun with Sharp Bullet, Bandana or Ricochet for area clear. Healing is built in, so items that cost HP become affordable.
LichDamage comes from healing scaled by Max HP, so stack Max HP, HP Regeneration and Life Steal and use weapons that trigger healing often or scale with HP: elemental burn with Snake and Scared Sausage, Slingshot, Chopper or Spiky Shield. Sources differ on the main weapon.
MasochistGetting hit adds % Damage, so tank hits with Armor, Max HP and HP Regeneration; Spiky Shield (unlocked by winning with Masochist) is the main recommendation, with Scissors, Ghost Axe or Medical Gun as alternatives. Blood Donation or Bloody Hand trigger the passive every second.

Stats by tier

Tier I Common
Damage
10 (+100% Ranged Damage)
Cooldown
0.78s
Crit
x2 (3% chance)
Range
400
Tier II Uncommon
Damage
15 (+100% Ranged Damage)
Cooldown
0.7s
Crit
x2 (3% chance)
Range
400
Tier III Rare
Damage
20 (+100% Ranged Damage)
Cooldown
0.62s
Crit
x2 (3% chance)
Range
400
Tier IV Legendary
Damage
30 (+100% Ranged Damage)
Cooldown
0.48s
Crit
x2 (3% chance)
Range
400

Damage in brackets is added from your stats before %Damage multiplies the total; see the damage formula or the calculator.

DPS at tier IV

64.4 DPS with no stats, 107.3 at 20 Ranged Damage and 171.7 at 50 (single target, every projectile hits, crits averaged): #11 of 29 weapons that scale with Ranged Damage. Full ranking or your own stats.