GA Item Gone: FS New Chrome Microbest 5.56 BCG

[Michael Whitten]

Item Name: Item Gone: FS New Chrome Microbest 5.56 BCG

Location: East Cobb

Zip Code: 30068

Item is for: Sale Only
Sale Price: $145

Caliber: 223_556

Willing to Ship: Yes

Bill of Sale Required?: No

Item Description: New, never installed Chrome Microbest BCG. Will ship and purchasers expense if not local to East Cobb. (Shipping costs have been around 10-15 for a padded envelope.)

Details copy and pasted from a site.

Microbest BCG Mil-Spec C158 HPT/MPI 5.56 Bolt Carrier Group – Chrome w Phosphate Extractor​

The bolt assembly is machined from Carpenter No. 158® steel, shot-peened, MP marked, HP tested, and has a tool steel extractor that is machined from bar stock. Microbest is the OEM manufacturer and supplier of bolt carrier groups for a lot of popular rifle manufacturers, including but not limited to, Bravo Company Mfg and Sons of Liberty.
Bolt Assembly:

• Bolt precision machined from Carpenter 158 alloy and vibratory tumbled
• Heat-treated and shot-peened
• Individual high pressure/proof (HP) and individually magnetic particle inspection
• Ejector from S7 tool steel, heat-treated and shot-peened
• 4 Coil Sprinco Extractor Spring
• Sprinco Ejector Spring
• Gas Rings 3 Mil-Spec
• Hard chrome-plated finish w Phosphate Extractor

Carrier:

• Machined from AISI 8620 steel
• Full-auto M16 profile
• Heat treated and Carburized/strain relieved
• Precision ground gas key interface
• Gas key from 4140 steel Heat Treated
• Grade 8 Gas Key Screws Staked, Phosphate Coated
• Hard chrome-plated finish

Misc:

• Cam pin from 4140 chromoly steel, heat-treated
• Firing pin from 8640 steel alloy, heat-treated, hard-chrome plated
• Firing pin retaining pin from 1038 carbon steel, heat-treated

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