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Geissele® - M16 Bolt Carrier Group - 5.56x45MM - C158 - Phosphate
Geissele® - M16 Bolt Carrier Group - 5.56x45MM - C158 - Phosphate

Geissele® - M16 Bolt Carrier Group - 5.56x45MM - C158 - Phosphate

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Your Price: $140.00
Part Number: 04-333
Availability: Out of Stock.
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The Geissele® M4A1 Bolt Carrier Group is by far one of the best bolt carrier groups on the market. The fit and finish on these are always top notch. They are also manufactured to the stringiest Mil-Spec standards. 

"Sourced from a Tier 1 supplier of the M4A1 carbine, this 5.56mm complete bolt carrier group is manufactured to the stringiest of military standards. Being off the same production line as bolt carrier groups found in carbines throughout the entire Department of Defense, these components are both high quality and highly reliable. The bolt carrier is manufactured out of 8620 steel with a chrome lined gas key and bolt recess in accordance with MIL-spec standards, and the bolts are produced out of Carpenter 158 also in accordance with MIL-spec standards. The gas keys are all properly torqued and staked, again in accordance with MIL-spec standards. All bolts have been high pressure tested (HPT) and mag particle inspected (MPI), exceeding the MIL-spec standard. Geissele also utilizes the latest revision extractor spring, O-ring and insert, which maximizes the reliability of the bolt carrier group. This ensures positive ignition and extraction of all types of ammunition, including military surplus ammunition known to have hardened primers." - Geissele Automatics®


  • Manufacturer - Geissele Automatics®
  • Caliber - 5.56x45mm, .223 Remington, .300 Blackout
  • HPT & MPI Bolt
  • Chrome Lined Bolt Recess and Gas Key
  • Properly Staked Gas Keys
  • Latest Revision Extractor Spring With O-Ring Insert
  • M16 Profile
  • Bolt Material - C158
  • Carrier Material - 8620
  • External Finish - Phosphate
  • Weight - 11.6 oz

What's Included

  1. Complete Geissele Automatics® Bolt Carrier Group Assembly

DISCLAIMER: "Geissele and Geissele Automatics" is a federally registered trademark of WHG Properties, LLC. Neither Classified Defense, nor this site is affiliated in any manner with, or otherwise endorsed by WHG Properties, LLC. The use of "Geissele and Geissele Automatics" on this website is merely to advertise the sale of tools and/or part used on WHG Properties, LLC components.

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