Microbest AR15 5.56 C158 MPI Bolt Carrier Group, Complete

5 reviews Write a Review
MSRP: $134.95
You save $39.96
Maximum Purchase:
2 units
Current Stock:

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****In-Stock ETA Expected June 14th****

Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are individually High Pressure Tested and then undergo a Magnetic Particle Inspection. We recommend degreasing and lubricating before installation. Ships in OEM packaging.

(All-Chrome with Phosphate Extractor can be found separately here.)


Nitride, Phosphate-Chrome or All-Chrome M-16 BCG

Mil Spec Carrier

  • 8620 Tool Steel
  • Full Auto M-16 cut

Mil-Spec Bolt

  • C158 Steel
  • Shot Peened
  • High Pressure Tested (HPT) 
  • Magnetic Particle Inspected (MPI)

Mil Spec Extractor

  • 4140 Steel
  • Extractor Spring
  • Black Extractor Insert
  • Mil-Spec O-Ring

Mil Spec Gas Key

  • 4130 Steel
  • Grade 8 Hardware
  • Properly Staked

Weight: 11.6oz

Customer Reviews

5 reviews

  • 5

    Great BCG

    I already know how good Microbest BCG's are, which is why I bought it. But the real 5 stars goes to Arftac for great service, communication, and on-time fast shipping. Keep up the good work folks

  • 5

    Top Tier BCG

    Chrome finished BCG. Microbest is a top tier BCG. The chrome finish is easy to clean and strong. Easy install and after a headspace check and a lube, went to the range and put a couple hundred rounds down range with no issues.

  • 5

    Microbest phosphate

    The best bcg period!

  • 5

    Microbest is as good as milspec phosphate gets

    Excellent phosphate bcg for a mk12. Was looking for a BCM when I came across this deal for the OEM maker of BCM. Excellent quality and super quick shipping and communications with ARFtac. Win win. Will buy more when available.

  • 5

    Microbest bcg

    For the price or even higher, phenomenal bcg. Ran it hard this weekend and did great. Shipping is absolutely amazing from Arftac! Plus, a sticker and we all know that’s why we buy parts.

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