Colt AR-15 Pin and Spring Sizes

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   Colt AR-15 Pin Sizes (biggerhammer.net) 
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