Drop chances

ItemStage 10Stage 50Stage 100Avg count
HiPower 7.62mm Ammo–7.5%2.2%0.7
Buckshot7.4%7.5%7.6%1.71
Bullet Tip7.5%7.5%7.4%1.69
Iron Arrow (Ammo)–7.5%1.4%0.57
Shotgun AP Slug (Ammo)–7.5%6.0%0.35
Bullet Casing7.5%7.4%7.6%1.69
Gunpowder7.6%7.4%7.5%1.67
Steel Arrowhead–7.3%7.3%0.56
HiPower 9mm Ammo–7.3%2.4%0.78
Steel Sledgehammer Parts2.9%6.9%7.9%0.19
Steel Club Parts2.7%6.9%8.0%0.19
Baton Parts2.9%6.9%8.1%0.19
Steel Knuckles Parts2.9%6.8%8.1%0.18
Steel Spear Parts3.0%6.8%8.3%0.19
Machete Parts2.9%6.8%7.8%0.18
Shotgun Parts2.9%6.6%7.1%0.14
Handgun Parts2.9%6.5%7.5%0.14
Machine Gun Parts2.9%6.4%7.3%0.13
Bow / Crossbow Parts2.8%6.4%7.3%0.13
Rocket Launcher Parts2.9%6.4%7.6%0.13
Rifle Parts2.8%6.3%7.2%0.13
Robotics Parts2.8%6.2%7.5%0.13
Iron Sledgehammer–5.2%1.2%0.05
Baseball Bat–5.2%1.4%0.05
Hunting Knife–5.0%1.3%0.05
Iron Knuckles–4.9%1.2%0.05
Iron Spear–4.8%1.3%0.05
Handgun Magazine4.4%4.8%4.6%0.05
Tech Planet4.7%4.7%4.5%0.05
Tactical Warfare4.4%4.7%4.6%0.05
Explosive Magazine4.5%4.6%4.6%0.05
Bow Hunters4.7%4.6%4.5%0.05
Rifle World4.6%4.6%4.7%0.05
Furious Fists4.6%4.5%4.6%0.05
Shotgun Weekly4.4%4.5%4.7%0.04
Knife Guy4.7%4.5%4.7%0.04
Big Hitters4.7%4.5%4.3%0.04
Sharp Sticks4.7%4.4%4.6%0.04
HiPower .44 Magnum Ammo–4.1%2.4%0.31
Iron Crossbow Bolt (Ammo)–4.0%1.3%0.31
KV-47 Machine Gun–3.7%0.94%0.04
Robotic Sledge–3.7%0.91%0.04
Double Barrel Shotgun–3.7%0.99%0.04
Pistol–3.6%0.97%0.04
Hunting Rifle–3.5%0.93%0.03
Molotov Cocktail (Ammo)4.3%1.9%0.46%0.04
modMeleeSerratedBlade1.7%1.8%1.6%0.02
Wooden Bow–1.8%0.46%0.02
Iron Crossbow–1.8%0.49%0.02
modMeleeStructuralBrace1.7%1.7%1.7%0.02
Pipe Bomb (Ammo)4.1%1.7%0.46%0.04
modMeleeWoodSplitter1.8%1.7%1.6%0.02
modMeleeGraveDigger1.7%1.6%1.7%0.02
modMeleeWeightedHead1.6%1.6%1.8%0.02
modMeleeClubBarbedWire1.5%1.6%1.4%0.02
modMeleeBunkerBuster1.5%1.6%1.6%0.02
modMeleeFortifyingGrip1.6%1.6%1.6%0.02
modMeleeClubBurningShaft1.5%1.5%1.4%0.02
modGunMeleeRadRemover1.5%1.4%1.4%0.01
modGunScopeLarge1.2%1.2%1.2%0.01
modMeleeIronBreaker1.2%1.2%1.1%0.01
modMeleeTemperedBlade1.1%1.2%1.1%0.01
modMeleeClubMetalChain1.1%1.2%1.1%0.01
modMeleeClubMetalSpikes1.2%1.1%1.2%0.01
modMeleeDiamondTip1.3%1.1%1.1%0.01
modGunTriggerGroupAutomatic1.2%1.1%1.3%0.01
modMeleeErgonomicGrip1.1%1.1%1.1%0.01
modGunBowPolymerString1.2%1.1%1.3%0.01
modGunMagazineExtender0.56%0.62%0.56%0.01
modGunDrumMagazineExtender0.65%0.60%0.54%0.01
modGunMeleeTheHunter0.62%0.58%0.65%0.01
modGunDuckbill0.59%0.57%0.57%0.01
modGunScopeSmall0.59%0.56%0.61%0.01
modGunTriggerGroupSemi0.61%0.56%0.61%0.01
modGunChoke0.55%0.56%0.61%0.01
modGunMuzzleBrake0.59%0.55%0.56%0.01
modGunFlashlight0.55%0.55%0.56%0.01
modGunForegrip0.50%0.54%0.57%0.01
modShotgunSawedOffBarrel0.58%0.53%0.61%0.01
modGunReflexSight0.43%0.53%0.41%0.01
modGunBipod0.53%0.53%0.59%0.01
modGunBowArrowRest0.44%0.47%0.45%0
modGunBarrelExtender0.39%0.46%0.40%0
modGunShotgunTubeExtenderMagazine0.39%0.45%0.43%0
modGunTriggerGroupBurst30.40%0.43%0.38%0
modGunRetractingStock0.44%0.43%0.43%0
modGunScopeMedium0.42%0.40%0.47%0
modGunSoundSuppressorSilencer0.46%0.39%0.43%0
modGunLaserSight0.51%0.38%0.45%0
modGunCrippleEm0.42%0.36%0.45%0
Pipe Shotgun8.3%––0
Pipe Rifle8.5%––0
7.62mm Ammo12%––0
Knuckle Wraps17%––0
Shotgun Shell (Ammo)13%––0
Primitive Bow8.4%––0
Pipe Pistol8.5%––0
9mm Ammo12%––0
Pipe Baton16%––0
Bone Knife17%––0
Iron Arrowhead7.4%––0
Pipe Machine Gun8.4%––0
Robotic Turret––1.6%0
.44 Magnum––1.6%0
Steel Arrow (Ammo)––2.4%0
Compound Crossbow––0.83%0
AP 9mm Ammo––4.0%0
Tactical Assault Rifle––1.6%0
Steel Crossbow Bolt (Ammo)––2.4%0
Pump Shotgun––1.7%0
Flaming Crossbow Bolt (Ammo)––2.4%0
Flaming Arrow (Ammo)––2.5%0
Steel Club––1.8%0
AP 7.62mm Ammo––3.9%0
Lever Action Rifle––1.6%0
AP .44 Magnum Ammo––4.0%0
Stun Baton––1.9%0
Stick of Dynamite (Ammo)––0.70%0
Machete––1.9%0
Steel Spear––1.9%0
Compound Bow––0.93%0
Steel Sledgehammer––2.0%0
Grenade (Ammo)––0.63%0
Steel Knuckles––1.9%0
Rocket Frag (Ammo)––0.13%0
Rocket HE (Ammo)––0.13%0

Average count per open at loot stage 50. From 40,000 simulated opens per stage; perks that raise loot are not counted.