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AR-15 Roll Pin Sizes Overview


2Xalpha

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Tried to make an overview of all roll pins used on an AR.

 

1/16" x 1/4" (1.59 x 6.35 mm):

  • Trigger Guard Detent Pin
  • Forward Assist Pawl Pin (New round type)
  • A1 Rear Sight Wheel Retaining Pin

 

1/16" x 5/16" (1.59 x 7.94 mm):

  • Forward Assist Pawl Pin (Old teardrop type)

 

1/16" x 7/16" (1.59 x 11.11 mm):

  • Ejector Retaining Roll Pin - (Btw, this size seems to be a rare special order type which is hard to find)

 

5/64" x 5/16" (1.98 x 7.94 mm), alternatively a 2x8 mm should fit:

  • Gas Tube Retaining Roll Pin
  • Charging Handle Latch Roll Pin

 

3/32" x 1/2" (2.38 x 12.70 mm):

  • Bolt Catch Retaining Pin
  • Forward Assist Pad Pin

 

3/32" x 5/8" (2.38 x 15.88 mm):

  • Forward Assist Retaining Roll Pin

 

1/8" x 7/16" (3.18 x 11.11 mm):

  • Type D Stock Sling Swivel Retaining Pin

 

1/8" x 1/2" (3.18 x 12.70 mm)

  • Front Sling Swivel Pin

 

1/8" x 5/8" (3.18 x 15.88 mm)

  • Trigger Guard Pivot Pin

 

1/8" x 3/4" (3.18 x 19.05 mm)

  • Rifle Buffer Pad Retaining Pin

 

1/8" x 7/8" 3.18 x 22.23 mm

  • Type D Stock Swivel Bracket Retaining Pin

 

Hope I got that right. All these might not be used on a race gun, but here you have it nonetheless. Note that some aftermarket parts use different pin sizes.

 

I think the image below sums up the most essential ones:

Roll pin sizes.png

Edited by 2Xalpha
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