Drop chances

ItemStage 10Stage 50Stage 100Avg count
HiPower 9mm Ammo–88%46%79.1
Shotgun AP Slug (Ammo)–88%84%21.39
HiPower 7.62mm Ammo–88%45%65.38
HiPower .44 Magnum Ammo–66%45%30.55
Gunpowder15%16%16%5.33
Bullet Casing16%16%16%5.3
Steel Arrowhead–15%15%2.01
Bullet Tip15%15%15%5.18
Buckshot15%15%15%5.14
Iron Arrow (Ammo)–11%2.2%1.6
Iron Crossbow Bolt (Ammo)–6.2%2.2%0.9
Steel Spear Parts4.3%5.5%5.7%0.11
Machete Parts4.4%5.5%5.7%0.1
Steel Sledgehammer Parts4.3%5.4%5.6%0.1
Steel Knuckles Parts4.2%5.3%5.7%0.1
Machine Gun Parts4.5%5.3%5.5%0.09
Shotgun Parts4.4%5.3%5.6%0.09
Steel Club Parts4.5%5.3%5.6%0.1
Robotics Parts4.4%5.1%5.4%0.09
Baton Parts4.3%5.1%5.6%0.1
Handgun Parts4.5%5.1%5.5%0.09
Bow / Crossbow Parts4.3%5.1%5.3%0.08
Rocket Launcher Parts4.5%5.1%5.4%0.09
Rifle Parts4.5%5.1%5.3%0.09
modMeleeSerratedBlade2.6%2.6%2.5%0.03
modMeleeGraveDigger2.6%2.6%2.6%0.03
modMeleeWeightedHead2.6%2.6%2.6%0.03
modMeleeStructuralBrace2.5%2.5%2.6%0.03
modMeleeWoodSplitter2.6%2.5%2.5%0.03
modMeleeFortifyingGrip2.4%2.5%2.4%0.02
modMeleeClubBurningShaft2.5%2.4%2.5%0.02
modMeleeBunkerBuster2.4%2.4%2.4%0.02
modMeleeClubBarbedWire2.3%2.4%2.3%0.02
modGunMeleeRadRemover2.2%2.2%2.0%0.02
modGunScopeLarge1.9%1.9%1.9%0.02
modMeleeIronBreaker1.8%1.9%1.7%0.02
modMeleeClubMetalChain1.9%1.8%1.9%0.02
modMeleeErgonomicGrip1.8%1.8%1.8%0.02
modMeleeDiamondTip1.8%1.8%1.8%0.02
modMeleeTemperedBlade1.7%1.8%1.8%0.02
modGunTriggerGroupAutomatic1.8%1.8%1.8%0.02
modGunBowPolymerString1.8%1.8%1.8%0.02
modMeleeClubMetalSpikes1.7%1.7%1.8%0.02
Hunting Knife–1.2%0.33%0.01
Iron Spear–1.2%0.27%0.01
Iron Sledgehammer–1.2%0.35%0.01
Baseball Bat–1.1%0.33%0.01
Iron Knuckles–1.1%0.36%0.01
modGunDuckbill0.89%0.94%0.90%0.01
modGunDrumMagazineExtender0.94%0.93%0.97%0.01
modGunMuzzleBrake0.92%0.93%0.96%0.01
modGunForegrip0.84%0.92%0.90%0.01
modGunTriggerGroupSemi0.89%0.89%0.91%0.01
modGunMeleeTheHunter0.84%0.88%0.84%0.01
modShotgunSawedOffBarrel0.87%0.87%0.83%0.01
modGunBipod0.89%0.86%0.83%0.01
modGunScopeSmall0.91%0.86%0.78%0.01
modGunFlashlight0.91%0.86%0.90%0.01
Pistol–0.86%0.27%0.01
Robotic Sledge–0.85%0.24%0.01
modGunMagazineExtender0.97%0.84%0.93%0.01
Double Barrel Shotgun–0.84%0.23%0.01
KV-47 Machine Gun–0.81%0.22%0.01
modGunChoke0.86%0.79%0.84%0.01
Hunting Rifle–0.79%0.21%0.01
modGunTriggerGroupBurst30.67%0.70%0.68%0.01
modGunBarrelExtender0.63%0.69%0.68%0.01
modGunReflexSight0.63%0.69%0.65%0.01
modGunScopeMedium0.72%0.67%0.72%0.01
modGunRetractingStock0.65%0.66%0.64%0.01
modGunShotgunTubeExtenderMagazine0.67%0.65%0.67%0.01
modGunLaserSight0.68%0.65%0.64%0.01
modGunBowArrowRest0.61%0.64%0.62%0.01
modGunSoundSuppressorSilencer0.64%0.60%0.62%0.01
modGunCrippleEm0.59%0.59%0.57%0.01
Molotov Cocktail (Ammo)1.0%0.45%0.08%0.01
Iron Crossbow–0.42%0.10%0
Pipe Bomb (Ammo)1.0%0.41%0.10%0.01
Wooden Bow–0.40%0.11%0
7.62mm Ammo93%––0
9mm Ammo93%––0
Shotgun Shell (Ammo)93%––0
Bone Knife3.8%––0
Iron Arrowhead15%––0
Pipe Machine Gun2.1%––0
Pipe Baton3.8%––0
Pipe Shotgun1.9%––0
Knuckle Wraps3.7%––0
Pipe Pistol1.8%––0
Primitive Bow2.0%––0
Pipe Rifle1.9%––0
AP .44 Magnum Ammo––67%0
AP 9mm Ammo––66%0
AP 7.62mm Ammo––67%0
Steel Arrow (Ammo)––3.7%0
Flaming Crossbow Bolt (Ammo)––3.9%0
Steel Knuckles––0.46%0
Flaming Arrow (Ammo)––3.8%0
Stick of Dynamite (Ammo)––0.19%0
Steel Crossbow Bolt (Ammo)––3.9%0
Lever Action Rifle––0.38%0
Robotic Turret––0.40%0
Steel Sledgehammer––0.44%0
Steel Club––0.41%0
Machete––0.43%0
Stun Baton––0.38%0
Steel Spear––0.46%0
.44 Magnum––0.40%0
Tactical Assault Rifle––0.32%0
Compound Crossbow––0.19%0
Compound Bow––0.20%0
Pump Shotgun––0.38%0
Grenade (Ammo)––0.14%0

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