AR-15 Parts Breakdown Reference

AR-15 Upper & Lower Parts Breakdown - Reference

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The Upper parts breakdown

http://klrworld.com/pdfs/ur1.jpg

Upper Parts List

Quote:

# 23 - Charging handle latch roll pin

# 24 - Charging handle latch

# 25 - Charging handle latch spring

# 26 - Charging handle

# 27 - Firing pin

# 28 - Bolt carrier key screw, each (2 required)

# 29 - Bolt carrier key

# 30 - Firing pin retaining pin

# 31 - Cam pin

# 32 - Bolt carrier, Semi-auto

# 33 - Bolt gas ring, improved, each (3 required)

# 34 - Bolt

# 35 - Extractor spring

# 36 - Extractor spring insert

# 37 - Extractor

# 38 - Extractor pin

# 39 - Ejector roll pin

# 40 - Ejector spring

# 41 - Ejector

# 42 - Forward Assist Assembly

# 43 - Pawl spring pin

# 44 - Pawl spring

# 45 - Pawl detent

# 46 - Forward assist pawl

# 47 - Forward assist spring

# 48 - Ejection port cover

# 49 - Ejection port cover spring

# 50 - Ejection port cover pin

# 51 - Pin retaining ring

# 52 - Upper Reciever

# 53 - Rear sight elevation spring pin

# 54 - Forward assist spring pin

# 55 - Rear sight elevation spring

# 56 - Rear sight elevation knob

# 57 - Rear sight elevation index

# 58 - Index screw

# 59 - Rear sight assembly

# 60 - Ball bearing

# 61 - Elevation index spring

# 62 - Rear sight windage knob

# 63 - Rear sight windage knob pin

# 64 - Rear sight index spring

# 65 - Rear sight ball bearing

# 66 - Rear sight flat spring

# 67 - Rear sight aperture

# 68 - Rear sight ball bearing

# 69 - Rear sight helical spring

# 70 - Rear sight base

# 71 - Rear sight windage screw

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The Lower parts breakdown

http://klrworld.com/pdfs/lr1.jpg

Lower Parts List

Quote:

# 72 - Action spring

# 73 - Buttcap spacer

# 74 - Buttstock,

# 75 - Buttplate

# 76 - Buttplate screw

# 77 - Trap Door Assembly, plastic

# 78 - Rear swivel screw

# 79 - Trap door hinge pin

# 80 - Trap door hinge

# 81 - Rear sling swivel

# 82 - Pistol grip screw

# 83 - Lock washer

# 84 - Pistol Grip

# 85 - Safety detent spring

# 86 - Safety detent

# 87 - Hammer and trigger pin (2 required)

# 88 - Magazine release button

# 89 - Magazine catch spring

# 90 - Trigger guard pivot roll pin

# 91 - Trigger guard

# 92 - Trigger spring

# 93 - Trigger, standard

# 94 - Disconnector

# 95 - Disconnector spring

# 96 - Pivot pin

# 97 - Pivot pin spring

# 98 - Pivot pin detent

# 99 - Magazine Catch

# 100 - Bolt catch spring

# 101 - Bolt catch plunger

# 102 - Bolt catch roll pin

# 103 - Bolt catch

# 104 - Safety selector lever

# 105 - Hammer spring

# 106 - Hammer with J pin, standard

# 107 - Buffer assembly

# 108 - Buffer retainer

# 109 - Buffer retainer spring

# 110 - Takedown pin spring

# 111 - Takedown pin detent

# 112 - Takedown pin

# 113 - Receiver extension

The Bolt & Carrier Group -

http://klrworld.com/pdfs/bc1.jpg

Quote:

A - Extractor Pin

B - Extractor

C - Extractor Spring Assembly

D - Ejector Roll Pin

E - Ejector

F - Ejector Spring

G - Bolt Gas Rings

H - Bolt

I - Firing Pin

J - Firing Pin Retaining Pin

K - Cam Pin

L - Bolt Carrier Key

M - Bolt Carrier Key Screws

N - Bolt

O - Bolt Carrier

Barrel Parts

http://klrworld.com/pdfs/bp1.jpg

Quote:

A - Handguard Snap Ring

B - Weld Spring

C - Handguard Slip Ring

D - Gas Tube Roll Pin

E - Gas Tube

F - Handguard Cap

G - Crush Washer

H - Muzzle Brake/Flash Suppressor

Very cool!

Thanks for posting that