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AR-15
Build List
Every component needed to build a complete AR-15 from scratch — broken down to every pin, spring, and detent. No sights included.
Note
This is a complete parts list for building a standard AR-15 platform. Sights and optics are not included — that is a separate decision based on your setup. The BCG and charging handle are purchased preassembled. This list breaks everything else down to individual parts so you know exactly what goes into the rifle.
Lower Receiver Assembly
Stripped Lower Receiver
▸Stripped lower receiver (serialized — the legally regulated firearm component)
Trigger Assembly
▸Trigger
▸Trigger spring
▸Trigger pin
▸Disconnector
▸Disconnector spring
Hammer Assembly
▸Hammer
▸Hammer spring
▸Hammer pin
Safety & Selector
▸Safety selector switch
▸Safety selector detent
▸Safety selector detent spring
Bolt Catch Assembly
▸Bolt catch
▸Bolt catch spring
▸Bolt catch plunger
▸Bolt catch roll pin
Magazine Release Assembly
▸Magazine release button
▸Magazine release spring
▸Magazine release catch
Pivot & Takedown Pins
▸Pivot pin
▸Pivot pin detent
▸Pivot pin detent spring
▸Takedown pin
▸Takedown pin detent
▸Takedown pin detent spring
Pistol Grip
▸Pistol grip
▸Pistol grip screw
▸Pistol grip lock washer
Trigger Guard
▸Trigger guard
▸Trigger guard roll pin (if not integrated into lower)
Buffer System
▸Buffer tube (receiver extension)
▸Buffer tube castle nut
▸Buffer tube end plate
▸Buffer (carbine or rifle weight)
▸Buffer retainer
▸Buffer retainer spring
▸Recoil / buffer spring
Stock
▸Buttstock (adjustable carbine stock or fixed rifle stock)
Upper Receiver Assembly
Stripped Upper Receiver
▸Stripped upper receiver
▸Forward assist assembly (plunger, spring, roll pin)
▸Ejection port dust cover
▸Dust cover spring
▸Dust cover hinge pin (C-clip)
Barrel
▸Barrel (length, profile, twist rate, and caliber of your choice)
▸Barrel nut (specific to handguard system)
Gas System
▸Gas tube (pistol, carbine, mid-length, or rifle length — matches gas system)
▸Gas tube roll pin
▸Gas block (low-profile, adjustable, or A2 front sight base)
Handguard / Rail
▸Handguard / free-float rail (M-LOK, KeyMod, or Picatinny quad rail)
▸Handguard mounting hardware (barrel nut, screws, anti-rotation tabs — varies by system)
Muzzle Device
▸Muzzle device (flash hider, muzzle brake, or compensator)
▸Crush washer or shim kit (for muzzle device timing)
Bolt Carrier Group (BCG)
▸Bolt carrier group — purchased preassembled
Charging Handle
▸Charging handle — purchased preassembled
Accessories & Completion
Magazine
▸Magazine (caliber and capacity of your choice — at least one to function test)
Sling & Attachment
▸Sling (single-point, two-point, or three-point)
▸Sling mount / QD sling swivel(s)
▸QD sling mount point on stock and/or handguard
Light & Accessories (Optional)
▸Weapon-mounted light
▸Light mount / pressure switch
▸Vertical or angled foregrip
▸Rail covers / hand stop
Total Individual Components
60+
parts, pins, springs, and detents in a complete AR-15 build (excluding sights, BCG, and charging handle)
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