Geissele Stressproof Bolt Assembly with Extractor

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Geissele Stressproof Bolt Assembly with Extractor

The Geissele Stressproof Bolt is made from Carpenter 158, however this is not your typical material spec’d by the US Government. Since Geissele wanted to take it to the next level, our engineers worked directly with the Carpenter Steel metallurgists in Reading PA, to produce a special heat of material known as Carpenter 158+. This material is cleaner with less impurities, ultimately making it stronger and more consistent. We did not stop there, we decided to forge the bolt. Using the same process used to produce upper and lower receivers, a forged bolt manipulates the grain structure of the metal and yields a bolt capable of 5 times the life of a mil-spec bolt. Each bolt is then rigorously inspected, high pressure tested, mag particle inspected and coated with Nanoweapon for maximum corrosion and wear resistance.

Geissele Stressproof Bolt Assembly with Extractor Specification

Compatibility:   AR15, M4
Cartridge:   .223, .223 Wylde, 5.56 NATO, 300 AAC Blackout
Bolt Finish:   Nanoweapon
Bolt Material:   Carpenter 465
Extractor Finish:   Nanoweapon
Extractor Material:   300M Stainless Steel
Weight (complete):   1.54oz


What is Geissele Nanoweapon?

Geissele Nanoweapon (also known as Picatinny DSL) is a family of Durable Solid Lubricant coatings which was developed by ARDEC. It is available exclusively from Geissele Automatics. We continued the development of Picatinny DSL so that its level of corrosion, wear and abrasion resistance is currently unmatched among firearm coatings. Nanoweapon is applied at low temperatures so that the underlying metallurgy of the part is non effected by the application process. Our coating also has a surface hardness roughly equivalent to synthetic diamond. This makes Geissele Nanoweapon harder than sand, easily rejecting carbon and making cleaning a breeze, on top of allowing the firearm to operate normally with less lubrication.

Geissele Stressproof Bolt Assembly with Extractor Notes


  • Geissele Stressproof Bolt (Shot Peened, High Pressure Tested, Mag Particle Inspected)
  • Extractor
  • Extractor Spring
  • Extractor O-ring and insert
  • Ejector
  • Ejector Spring
  • Ejector Pin

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