AR-15 Bolt Carrier Measurements & Diagrams

A working reference set of bolt carrier group measurements, used when inspecting a rifle.

Bolt Carrier Group slide deck
Bolt Carrier Group overview
AR-15 Gas Key measurements
Gas Key measurements
Bolt Carrier Group bolt test
Bolt test
Bolt Carrier Group bolt diagram 1
Bolt diagram 1
Bolt Carrier Group bolt tail measurements 1
Bolt tail measurements
Bolt Carrier Group bolt tail measurements 2
Bolt tail measurements (cont.)
Bolt Carrier Group bolt diagram 4
Bolt diagram 4
Bolt measurements, boat tail and more
Bolt measurements — boat tail and more
AR-15 Bolt shoulder measurement
Bolt shoulder measurement
AR-15 Bolt face measurements
Bolt face measurements
AR-15 Bolt parts
Bolt parts, complete
AR-15 Extractor diagram
Extractor diagram
AR-15 Extractor measurements
Extractor measurements
AR-15 Firing Pin
Firing pin
Firing Pin depth test
Firing pin depth test

All information posted here is for informational use only. If you make any modifications to your firearms based on this content, you do so at your own risk. Done incorrectly, this can render a weapon unsafe or unusable.

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