When reloading the gun, a mark appears on the reload bar, similar to the Cog of Battle. Pressing reload or firing at the right time will increase the gun's damage. Each successful reload will also make the reload time shorter, making another successful reload harder to pull off. As the gun's damage increases, the projectiles become larger and turn into faces wearing sunglasses after four successful reloads. Missing a reload will reset the bonuses. After 14 reloads, the gun will reload instantly and the active reload will be missed, resulting in the damage bonus resetting.
The damage dealt by the gun approximately doubles for the first four reloads. Past that, the damage continues to grow infinitely, but at a slower rate. Like all guns, the Rad Gun will automatically reload if it is switched away from. However, it will receive a significant damage penalty. The damage for the first eight reloads are as follows:
Reloads
Reload Time
Damage
(Active Reload)
DPS†
(Active)
Damage
(Passive Reload)
DPS†
(Passive)
Projectile Appearance
None
None
4
24.615
4
29.091
1
0.9
8.64
59.25
6
43.64
2
0.6
15.552
106.642
9
65.455
3
0.6
31.104
223.502
15
109.091
4
0.48
62.208
469.494
25
181.818
5
0.36
74.650
573.006
6
0.32
89.579
699.532
7
0.28
107.496
854.273
8
0.24
128.995
1034.258
† DPS for Active reloads assume the successful reloading of the gun when the crosshair is directly alligned with the gun while an immediate switch between guns is assumed for passive damage, resulting in listed differences in damage with no reloads.
Successfully completing the active reload also makes "NOICE", "COOL", or "RAD" appear above the player's head. Failure results in the word "WACK" instead.
Synergies ETG
Kung Fu Hippie, Rappin' Surfer - If the player has Sunglasses, Rad Gun's magazine size is increased to 20 and its reload time is increased, giving more time to hit the mark. Grants 1.33 coolness. The maximum amount of reloads is increased from 14 to 17, although getting the 16th reload will require two Super Hot Watchs.
Item Interactions
Easy Reload Bullets - Reloading by rolling does not reset the damage bonus of the Rad Gun, allowing it to be used at max level indefinitely with minimal effort.
Cog of Battle - The active reload effects of the cog are combined with those of the Rad Gun.
Super Hot Watch - Standing still will also slow time on the Rad Gun's reload, making higher levels easier to hit.
Duct Tape - Duct taping the Rad Gun onto a different weapon will duct tape each projectile tier of the Rad Gun as a different module, causing the new gun to act like a shotgun. Visually, the Rad Gun will appear as five different extra ammo bars in the UI instead of one.
Cormorant - All reloads are instantaneous, making it impossible to hit the Rad Gun's active reload.
Refilling the Rad Gun with an Ammo pickup or taking the elevator to the next chamber is considered an automatic reload.
Swapping to another weapon for a few seconds will automatically reload the Rad Gun. This will cause the damage bonus to swap to the passive reload corresponding to its level, which caps at 25 damage per bullet.
There is a limit on the maximum reload combo which depends on the reload speed.
At default reload speed, the gun can be reloaded a maximum of 14 times in a row, after which the reload meter will not appear at all.
Increasing the reload speed will decrease the number of times it can be reloaded in a row as it reaches the reload meter's maximum speed faster.
The description is a reference to the "Are you a bad enough dude?" meme, otherwise known as the intro to the game Bad Dudes, an NES port of the Japanese arcade game DragonNinja.
The appearance and behavior of the gun are references to the Olli Olli games, taking the main character's hat, shirt color and a skateboard, as well as needing to time the reload in order to use the gun effectively.
The gun's "Rad" theme and the skateboard the gun lays on are references to the youth culture of the 90's.
Cog of Battle. Pressing reload or firing at the right time will increase the gun's damage. Each successful reload will also make the reload time shorter, making another successful reload harder to pull off. As the gun's damage increases, the projectiles become larger and turn into faces wearing sunglasses after four successful reloads. Missing a reload will reset the bonuses. After 14 reloads, the gun will reload instantly and the active reload will be missed, resulting in the damage bonus resetting.
Kung Fu Hippie, Rappin' Surfer - If the player has Sunglasses, Rad Gun's magazine size is increased to 20 and its reload time is increased, giving more time to hit the mark. Grants 1.33 coolness. The maximum amount of reloads is increased from 14 to 17, although getting the 16th reload will require two 
Super Hot Watchs.
Easy Reload Bullets - Reloading by rolling does not reset the damage bonus of the Rad Gun, allowing it to be used at max level indefinitely with minimal effort.
Duct Tape - Duct taping the Rad Gun onto a different weapon will duct tape each projectile tier of the Rad Gun as a different module, causing the new gun to act like a shotgun. Visually, the Rad Gun will appear as five different extra ammo bars in the UI instead of one.
Unused: Roll Shot - If the player has Rolling Eye, it causes an unknown effect.
Ammo pickup or taking the elevator to the next chamber is considered an automatic reload.
The Brimsly in Exit the Gungeon.
Rad Gun's appearance with the
