AR-15 Bolt Carrier Group Reference Drawings

September 3, 2026

Reference drawings for the AR-15 Bolt Carrier Group, with dimensional markups.

Bolt Carrier Assembly diagram — Bolt Carrier Assembly

AR-15 Gas Key diagram with markups and dimensions — Gas Key — markups and dimensions for bolts and all gas sizes

AR-15 Bolt Carrier Group diagram, complete bolt length — Bolt Carrier Group — complete bolt length

AR-15 Bolt Carrier Group diagram, internal bolt holes and vent hole — Bolt Carrier Group — internal bolt holes, vent hole

Bolt Assembly diagram — Bolt Assembly

AR-15 Bolt diagram, cam hole, boat tail interior, bolt ring — Bolt — cam hole, boat tail interior, bolt ring

AR-15 Bolt diagram, boat tail, bolt face, firing pin hole — Bolt — boat tail, bolt face, firing pin hole

Bolt diagram 8448510-BOLT0003 — Bolt reference diagram

AR-15 Bolt Cam Pin diagram, diameter and hole markups — Bolt Cam Pin — diameter and hole

AR-15 Extractor diagram with markups — Extractor

AR-15 Firing Pin diagram — Firing Pin

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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