Sionics Weapon Systems AR-15 Mil-Spec Bolt Assembly - HP/MPI Tested


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Sionics Weapon Systems AR-15 Mil-Spec Bolt Assembly - HP/MPI Tested


Sionics Weapon Systems AR-15 Mil-Spec Bolt Assemblies are manufactured from Carpenter 158 Steel. Each Bolt is Shot Peened and comes with a Sprinco Heavy Extractor Spring and Black Spring Insert. Every Bolt is 100% High Pressure Tested and Magnetic Particle Inspected.

Spare bolts are recommended regardless, but become even more necessary when shooting high-pressure Mil-Spec ammunition in conjuction with either a suppressor, shorter gas systems, or piston guns (or combinations of those conditions).  A Sionics Mil-Spec Bolt Assembly has been properly tested for stress tolerances to help ensure reilable operation.  The addition of a Sprinco 5-Coil spring makes for more robust and reliable extraction, crucial if using steel cased ammunition.  

  • Mil-Spec Carpenter No.158 Steel
  • HPT Bolt (High Pressure Test / Proof)
  • MPI Bolt (Magnetic Particle Inspected)
  • Shot Peened Bolt
  • Tool Steel Extractor
  • Sprinco 5-Coil Heavy Duty Extractor Spring
  • Black Extractor Insert


Manufacturer Sionics Weapon Systems
Shipping Restriction ITAR/Export Restricted
MSRP $69.95
Material Carpenter 158 Steel
Material Finish Manganese Phosphate Parkerization
Weapon Model AR15/M16
Mil-Spec/Mil Issued Equipment Yes


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