SPIKES TACTICAL NICKEL BORON M16 BOLT CARRIER GROUP 5.56 & 300
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If purchasing a BCG with a barreled upper, we recommend the following:
M16 Profile BCG for all Pistol / SBR uppers and 16" barrels with a carbine
gas system. AR15 Profile BCG for 16" barrels with a mid-length gas system,
18", 20" and 24" barrels. These are general recommendations. Please call us
with any questions or concerns before you place your order.
Thank You, MAS Defense.



Spikes Complete Bolt Carrier Group ST5BG03
.223 / 5.56 NATO and 300 AAC Blackout



This is the same Spikes Mil-Spec BCG but the only difference is that it’s coated in
Nickel Boron by FailZero using their EXO Technology. Yes, it’s High Pressure Tested
and Magnetic Particle Inspected (HPT/MPI).

Nickel Boron has proven itself to be the most durable finish on the market. It’s much
smoother than Hard Chrome, it’s easier to clean, makes the rifle cycle smoother, it can
be run almost lube free for thousands of rounds, and it will never chip, peal, or flake
off! Because of these benefits, Nickel Boron is being adopted by the Military as well as
many Government agencies. As you can see, these BCGs are a huge improvement over
a standard Phosphate BCG and it’s even an improvement over Hard Chrome.


Carrier Specs
- Machined from 8620 Tool Steel
- Machined to M16 specs with shrouded firing pin.
- Nickel Boron Coating inside and out.
- Each carrier is finished with the Spike's Tactical Spider logo!

Carrier Key Specs
- Forged Mil-Spec carrier key
- Nickel Boron Coating inside and out.
- Attached with Grade 8 hardware and Properly staked.

Bolt Specs
- Machined from Mil-Spec Carpenter 158 Steel
- Shot Peened
- Magnetic Particle Inspected
- Mil-Spec Extractor Spring
- Mil-Spec Black Extractor Insert
- Mil-Spec Viton O-Ring
- Tool Steel Extractor
- Nickel Boron Coating inside and out

  • Item #: ST5BG03
  • Condition: New

SPIKES TACTICAL NICKEL BORON M16 BOLT CARRIER GROUP 5.56 & 300

Price: $199.99
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