AR15 Pin and Spring Sizes

Colt AR-15 Pin Sizes

AR-15/M-16 Pin and Spring Sizes The Following Sizes Represent MILSPEC. Variances may be encountered based on non-MILSPEC sources.

Pins Description

Qty

OA L

L a r g e En d

A1 Sight Drum Roll Pin

1

0.250

0.062

A2 Windage Drum Roll Pin

1

0.375

0.062

Bolt Cam Pin

1

0.800

0.312

Bolt Catch Roll Pin

1

0.437

0.093

Bolt Ejector Roll Pin

1

0.437

0.062

Bolt Extractor Pin

1

0.446

0.099

Ejection Port Hinge Pin

1

3.850

0.125

Elevation Housing Retaining Pin

1

0.625

0.093

Forward Assist Pawl Roll Pin

1

0.250

0.062

Forward Assist Retaining Roll Pin

1

0.625

0.093

Firing Pin

1

3.280

0.155

Firing Pin Retaining Pin

1

0.820

0.096

Front Sight Taper Pins

2

0.850

0.143

Front Takedown Pin

1

1.310

0.248

Gas Tube Roll Pin

1

0.312

0.081

Rear Takedown Pin

1

1.010

0.248

Selector Detent Pin

1

0.395

0.141

Sear Pin

1

0.905

0.125

Takedown Detent Pins

2

0.328

0.091

Trigger & Hammer Pins

2

0.905

0.155

Trigger Guard Roll Pin

1

0.625

0.093

Springs

file:///C|/Temp/Temp/AR15%20Pin%20&%20Spring%20Sizes.html file:///C|/Temp/Temp/AR15%20Pin%2 0&%20Spring%20Sizes.html (1 of 2)12/8/2004 6:42:03 AM

Small En d

0.104 0.124

0.124

M isc.

.054 (Tip)

Colt AR-15 Pin Sizes

Qu an ti ty

OA L

Outside Dimension

Number of  Coils

A1 Sight Detent Spring

1

.50

.118

13

A2 Elev. Housing Spring

1

.90

.220

12

A2 Sight Detent Spring

3

.277

.121

7

Buffer Spring (carbine)

1

10.7

.940

36

Buffer Spring (rifle)

1

12.5

.940

44

Bolt Catch Spring

1

.517

.154

11

Bolt Ejector Spring

1

.904

.10

28

Buffer Retainer Spring

1

.940

.180

14

Disconnector Spring

1

.350

.150

7

Ejection Port Cover Spring

1

.670

1.85

30

Extractor Spring

1

.222

.145

5

Forward Assist Pawl Spring

1

.290

.079

10 1/2

Forward Assist Spring

1

1.171

.420

9

Front Sight Detent Spring

1

.750

.115

20

Magazine Catch Spring

1

1.15

.294

8

Safety Selector Spring

1

.904

.10

28

Takedown Pin Spring

2

1.10

.088

40

De s cri p ti o n

file:///C|/Temp/Temp/AR15%20Pin%20&%20Spring%20Sizes.html file:///C|/Temp/Temp/AR15%20Pin%2 0&%20Spring%20Sizes.html (2 of 2)12/8/2004 6:42:03 AM