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Colt AR-15 Pin and Spring Sizes
The Following Sizes Represent Milspec and DO NOT Account for Colt Variances
Pins
| Description | Quantity | OAL | Large End | Small End | Misc. |
| 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 | ||
| F/A pawl roll pin | 1 | 0.250 | 0.062 | ||
| F/A retaining roll pin | 1 | 0.625 | 0.093 | ||
| Firing pin | 1 | 3.280 | 0.155 | 0.104 | .054 (Tip) |
| Firing pin retainer | 1 | 0.820 | 0.096 | ||
| Front sight taper pins | 2 | 0.850 | 0.143 | 0.124 | |
| Front take down pin | 1 | 1.310 | 0.248 | ||
| Gas tube roll pin | 1 | 0.312 | 0.081 | ||
| Rear take down pin | 1 | 1.010 | 0.248 | ||
| Selector detent pin | 1 | 0.395 | 0.141 | 0.124 | |
| Take down dent pins | 2 | 0.328 | 0.091 | ||
| Trigger / Hammer pins | 2 | 0.905 | 0.155 | ||
| Trigger guard roll pin | 1 | 0.625 | 0.093 |
Springs
| Description |
Quantity
|
Diameter
|
Outside
Dimension
|
Number of Coils
|
| Bolt ejector spring |
1
|
.904
|
.10
|
28
|
| Safety Selector spring |
1
|
.904
|
.10
|
28
|
| Front sight detent spring |
1
|
.750
|
.115
|
20
|
| Ejection port cover spring |
1
|
.670
|
1.85
|
30
|
| F/A assist spring |
1
|
1.171
|
.420
|
9
|
| F/A assist pawl spring |
1
|
.290
|
.079
|
10 1/2
|
| A1 sight detent spring |
1
|
.50
|
.118
|
13
|
| A2 sight detent spring |
3
|
.277
|
.121
|
7
|
| Magazine catch spring |
1
|
1.15
|
.294
|
8
|
| A2 elev. housing spring |
1
|
.90
|
.220
|
12
|
| Extractor spring |
1
|
.222
|
.145
|
5
|
| Disconnector spring |
1
|
.350
|
.150
|
7
|
| Takedown pin spring |
2
|
1.10
|
.088
|
40
|
| Buffer retainer spring |
1
|
.940
|
.180
|
14
|
| Action spring rifle |
1
|
12.5
|
.940
|
44
|
| Action spring carbine |
1
|
10.7
|
.940
|
36
|
| Bolt catch spring |
1
|
.517
|
.154
|
11
|
Pin Diameters Courtesy John M.
Last Modified on
February 5, 2000
aalbert@biggerhammer.net