SIONICS Bolt Carrier Group (HP/MPI) - Auto
SIONICS Bolt Carrier Group (HP/MPI) - Auto
HK Armament Systems

SIONICS Bolt Carrier Group (HP/MPI) - Auto

Regular price $142.00 $0.00 Unit price per
Shipping calculated at checkout.
  • Milspec Carpenter No. 158® Steel
  • HPT Bolt - High Pressure Tested / Proof
  • MPI Bolt - Magnetic Particle Inspected
  • Shot Peened Bolt
  • Chrome Lined Carrier - Auto
  • Chrome Lined Gas Key
  • Gas Key Hardened to USGI Specifications
  • Grade 8 Hardened Fasteners
  • Key Staked Per Mil-Spec
  • Tool Steel Extractor
  • Sprinco Heavy Duty Extractor Spring
  • Black Extractor Insert
  • Machined to USGI Specifications


The SIONICS Bolt Carrier Group - Auto Version - for your AR15, M16 or M4.  Parkerized Exterior and Chrome Lined inside the Carrier. Machined to USGI specifications. This M16/M4 Carrier includes the proper Mil-Spec Gas Key. The Gas Key is Chrome Lined and Heat Treated per USGI specifications. The Gas Key is secured to the Carrier with USGI Domestic manufactured Grade 8 Fasteners and properly staked per Military-Specifications. These properly hardened parts insure a strong staking and proper Gas System functioning. The Bolt Assembly is machined from Mil-Spec Carpenter No. 158® Steel, Shot Peened for increased strength and includes Tool Steel machined Extractor and Ejector, HD Sprinco Extractor Spring and is High Pressure Tested and Magnetic Particle Inspected.

Prior to shipping, all SIONICS Bolt Carrier Groups are Test Fired for function. Because of the Test Firing Procedure, the Bolt Carrier Group will show handling marks consistent with these Quality Control Procedures.