Attachments are bought with points at the gunsmith bench. The mastery level is the level you need with that weapon to fit the part.
Ammo Name Effect Fits Rarity Price Mastery Soft-Point Rounds +12% Damage -1 Penetration Pistols, SMGs, Rifles, Snipers, LMGs Issue 900 pts LV 1 Steel-Core Rounds Pistols, SMGs, Rifles, Snipers, LMGs Issue 1,000 pts LV 1 Subsonic Rounds -45% Noise -15% Range -5% Damage Pistols, SMGs, Rifles Field 700 pts Slug Load Fires one slug instead of pellets 90 Slug Damage -70% Spread +60% Range Shotguns Issue 800 pts LV 1 Heavy Buck +30% Damage -10% Spread -2 Pellets Shotguns Field 600 pts Phosphor Rounds Every 4th hit sets the target on fire Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Legendary Black Market Cold Iron Slugs Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Legendary Black Market
Barrel Name Effect Fits Rarity Price Mastery Heat Shield SMGs, Rifles, Shotguns, LMGs Field 650 pts Cooling Fins SMGs, Rifles, LMGs Issue 900 pts LV 2 Match Sleeve -25% Spread +15% Range +10% Aim Time Rifles, Snipers Specialist 1,200 pts LV 2 Ported Shroud SMGs, Rifles, LMGs Issue 800 pts LV 1
Charm Name Effect Fits Rarity Price Mastery Dog Tags Field 150 pts Brass Medal Issue 400 pts LV 3 Bullet Cord Field 200 pts LV 1 Bunker Key Specialist 600 pts LV 5 Tin Whistle Field 250 pts
Grip Name Effect Fits Rarity Price Mastery Checkered Grip Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Field 350 pts Horn Grip -10% Equip Time -4% Aim Time Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Issue 450 pts LV 1 Moulded Grip Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Issue 400 pts Ferryman's Grip Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Legendary Black Market
Magazine Name Effect Fits Rarity Price Mastery Extended Magazine +40% Magazine +12% Reload Time +5% Aim Time SMGs, Rifles Issue 900 pts LV 1 Pistol Extension +50% Magazine +8% Reload Time Pistols Issue 600 pts Taped Magazines -35% Reload Time on every second reload -1% Move Speed SMGs, Rifles Field 700 pts LV 1 Drum Magazine +100% Magazine +30% Reload Time -4% Move Speed +12% Aim Time SMGs, Rifles, LMGs Specialist 1,600 pts LV 3 Pull-Loop Magazine Pistols, SMGs, Rifles Issue 800 pts LV 1 Brass Base Plate -6% Reload Time +2 Magazine Pistols, SMGs, Rifles Field 450 pts Gravedigger Drum +25% Damage on the last 10 rounds +80% Magazine +20% Reload Time -3% Move Speed SMGs, Rifles, LMGs Legendary Black Market
Muzzle Name Effect Fits Rarity Price Mastery Slotted Compensator SMGs, Rifles, LMGs Issue 750 pts LV 3 Baffle Brake -28% Recoil +30% Noise +5% Aim Spread Rifles, Snipers, LMGs Specialist 1,100 pts LV 4 Flash Cone SMGs, Rifles, Snipers, LMGs Field 600 pts Tin Can Suppressor Kills hide you from the horde for 1 s -60% Noise -10% Range -5% Damage Pistols, SMGs, Rifles, Snipers Specialist 1,400 pts LV 2 Full Choke Shotguns Issue 700 pts Duckbill Spreader +2 Pellets +45% Spread -20% Range Shotguns Issue 700 pts LV 1 Muzzle Weight -12% Recoil -10% Sway +8% Aim Time Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs Field 500 pts Whisper Baffle Kills hide you from the horde for 2 s -80% Noise -8% Recoil Pistols, SMGs, Rifles, Snipers, LMGs Legendary Black Market
Optic Name Effect Fits Rarity Price Mastery Peep Sight -15% Aim Spread -5% Aim Time SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Field 400 pts Short Tube Scope -25% Aim Spread +10% Range +10% Aim Time SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Issue 900 pts LV 1 Long Scope -45% Aim Spread +25% Range +25% Aim Time +10% Sway Rifles, Snipers, LMGs Specialist 1,500 pts LV 2 Ring Sight -12% Aim Time -8% Aim Spread SMGs, Rifles, Shotguns, LMGs, Specials Field 500 pts Dusk Glass -35% Aim Spread +20% Range +20% Aim Time Rifles, Snipers Specialist 1,800 pts LV 4 Side Scope -30% Aim Spread +15% Range +5% Aim Time Rifles, Snipers Specialist 1,300 pts LV 3 Owl-Eye Sight Headshots mark the target for the team for 6 s -40% Aim Spread +20% Range +10% Aim Time Rifles, Snipers, LMGs Legendary Black Market
Sling Name Effect Fits Rarity Price Mastery Canvas Sling Field 300 pts Leather Sling Issue 500 pts LV 1 Carry Strap +2% Move Speed -4% Equip Time Issue 450 pts
Stock Name Effect Fits Rarity Price Mastery Recoil Pad SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Field 400 pts Cheek Riser Rifles, Snipers, LMGs Issue 600 pts LV 1 Ammo Cuff -8% Reload Time +10% Reserve Ammo Rifles, Snipers, Shotguns Field 550 pts Steel Butt Plate +20% Stagger -1% Move Speed SMGs, Rifles, Shotguns, Snipers, LMGs Field 500 pts LV 1 Stock Wrap Field 300 pts Widow's Stock No recoil climb while crouched -8% Recoil SMGs, Rifles, Shotguns, Snipers, LMGs Legendary Black Market
Trigger Name Effect Fits Rarity Price Mastery Hair Trigger Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Issue 600 pts LV 1 Auto Sear Full-auto +10% Recoil +8% Spread Pistols, SMGs, Rifles Specialist 1,500 pts LV 3 Burst Sear Pistols, SMGs, Rifles, LMGs Specialist 1,200 pts LV 2 Heavy Spring Pistols, SMGs, Rifles, Shotguns, Snipers, LMGs, Specials Field 400 pts
Underbarrel Name Effect Fits Rarity Price Mastery Trench Bayonet 120 Bayonet Damage 1.6 m Bayonet Reach +4% Aim Time Rifles, Shotguns, Snipers Issue 700 pts Wood Foregrip -12% Recoil -6% Spread +5% Aim Time SMGs, Rifles, Shotguns, LMGs Field 600 pts Folding Bipod -40% Spread while crouched +6% Aim Time -2% Move Speed Rifles, Snipers, LMGs Issue 900 pts LV 2 Hand Stop SMGs, Rifles, Shotguns Field 450 pts Spike Bayonet 160 Bayonet Damage 1.5 m Bayonet Reach +5% Sway Rifles, Snipers Specialist 900 pts LV 2 Sapper's Spike 260 Bayonet Damage 1.7 m Bayonet Reach +1.4 m Lunge +5% Sway Rifles, Shotguns, Snipers, LMGs Legendary Black Market
Wrap Name Effect Fits Rarity Price Mastery Friction Tape -6% Equip Time -3% Aim Time Field 250 pts Cord Wrap Field 300 pts Bandage Wrap Field 250 pts
Pictures Parts Pick a slot, see the numbers, fit the part. Fitted Optic Every part shows on the gun in your hands. Long Scope Turreted glass for the far end of the corridor. Dusk Glass A big-objective scope that drinks the bunker's light. Legendary Sight Black Market legendary: headshots mark the target for the team. 
