Drop chances

ItemStage 10Stage 50Stage 100Avg count
Iron Arrow (Ammo)–24%4.9%3.21
HiPower 9mm Ammo–24%8.0%4.7
Shotgun AP Slug (Ammo)–24%21%1.7
HiPower 7.62mm Ammo–24%7.7%3.71
Bullet Tip19%19%19%5.75
Buckshot19%19%19%5.72
Gunpowder18%18%18%5.79
Bullet Casing18%18%18%5.67
Steel Arrowhead–15%15%1.18
HiPower .44 Magnum Ammo–14%7.8%1.79
Iron Crossbow Bolt (Ammo)–13%4.7%1.74
Steel Club Parts0.85%0.85%0.85%0.01
Baton Parts0.80%0.80%0.80%0.01
Machine Gun Parts0.78%0.78%0.78%0.01
Shotgun Parts0.77%0.77%0.77%0.01
Steel Knuckles Parts0.77%0.77%0.77%0.01
Rifle Parts0.77%0.77%0.77%0.01
Handgun Parts0.76%0.76%0.76%0.01
Steel Spear Parts0.75%0.75%0.75%0.01
Rocket Launcher Parts0.74%0.74%0.74%0.01
Machete Parts0.74%0.74%0.74%0.01
Steel Sledgehammer Parts0.72%0.72%0.72%0.01
Bow / Crossbow Parts0.71%0.71%0.71%0.01
Robotics Parts0.65%0.65%0.65%0.01
modMeleeWoodSplitter0.51%0.51%0.51%0.01
modMeleeStructuralBrace0.50%0.50%0.50%0.01
modMeleeSerratedBlade0.50%0.50%0.50%0.01
modGunMeleeRadRemover0.44%0.44%0.44%0
modMeleeWeightedHead0.44%0.44%0.44%0
modMeleeGraveDigger0.40%0.40%0.40%0
modMeleeClubBurningShaft0.40%0.40%0.40%0
modMeleeBunkerBuster0.40%0.40%0.40%0
modMeleeClubMetalSpikes0.38%0.38%0.38%0
modMeleeClubBarbedWire0.38%0.38%0.38%0
modMeleeFortifyingGrip0.38%0.38%0.38%0
modMeleeClubMetalChain0.36%0.36%0.36%0
modMeleeTemperedBlade0.34%0.34%0.34%0
modMeleeDiamondTip0.34%0.34%0.34%0
modGunScopeLarge0.33%0.33%0.33%0
modGunTriggerGroupAutomatic0.32%0.32%0.32%0
modGunBowPolymerString0.31%0.31%0.31%0
modMeleeIronBreaker0.30%0.30%0.30%0
modMeleeErgonomicGrip0.30%0.30%0.30%0
modGunChoke0.20%0.20%0.20%0
modGunDrumMagazineExtender0.18%0.18%0.18%0
modGunForegrip0.17%0.17%0.17%0
modShotgunSawedOffBarrel0.17%0.17%0.17%0
modGunDuckbill0.16%0.16%0.16%0
modGunScopeSmall0.16%0.16%0.16%0
modGunFlashlight0.16%0.16%0.16%0
modGunMuzzleBrake0.15%0.15%0.15%0
modGunLaserSight0.14%0.14%0.14%0
modGunBowArrowRest0.14%0.14%0.14%0
modGunBipod0.14%0.14%0.14%0
modGunTriggerGroupSemi0.14%0.14%0.14%0
modGunBarrelExtender0.14%0.14%0.14%0
modGunRetractingStock0.14%0.14%0.14%0
modGunTriggerGroupBurst30.13%0.13%0.13%0
modGunMeleeTheHunter0.13%0.13%0.13%0
modGunReflexSight0.13%0.13%0.13%0
modGunMagazineExtender0.12%0.12%0.12%0
modGunShotgunTubeExtenderMagazine0.12%0.12%0.12%0
modGunScopeMedium0.10%0.10%0.10%0
modGunSoundSuppressorSilencer0.09%0.09%0.09%0
modGunCrippleEm0.08%0.08%0.08%0
Shotgun Shell (Ammo)39%––0
Iron Arrowhead15%––0
9mm Ammo39%––0
7.62mm Ammo39%––0
Steel Arrow (Ammo)––8.4%0
Flaming Arrow (Ammo)––8.4%0
AP 9mm Ammo––13%0
AP .44 Magnum Ammo––13%0
Flaming Crossbow Bolt (Ammo)––8.3%0
AP 7.62mm Ammo––14%0
Steel Crossbow Bolt (Ammo)––8.1%0

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