The Rainier Arms Precision Match Grade BCG – 5.56 Nitride is machined and finished to a higher standard to meet and exceed all Mil Spec. It is machined using the most precise equipment in the industry. The bolts are MPI/HP tested & Marked to give you ultimate confidence in your weapon system.
Carrier:
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- Full Auto Carrier
- SAE 8620
- Heat Treated
- Nitride
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Bolt:
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- 5.56/.223
- Carpenter 158 Steel
- Shot Peened
- Heat Treated
- Nitride
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Extractor:
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- Machined from bar
- Shot Peened
- Heat Treated
- Maganese Phosphate
- Nitride
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Extractor Spring:
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- Chrome Silicone for Longer Life
- Black Insert as per current Mil-Spec
- “O” Ring is high temp resistant dark brown
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Extractor Retaining Pin:
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- Precision Machined
- Precision ground to diameter
- Precision ground to length
- Heat Treated
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Firing Pin:
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- Machined and then precision ground for accuracy
- Heat Treated
Gas Key Bolt:
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- Precision manufactured in house with extra deep knurling
- Grade 8
- 1200 degree locking patch is factory applied to threads to help insure long lasting tightness
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Gas key:
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- Hard Chrome lined gas tube as per Mil-Spec
- Bolts installed to proper torque
- Staking on both sides of both bolts
- Nitride
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Cam Pin:
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- Precision machined
- Heat Treated
- Nitride
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Firing Pin Retaining Pin:
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- Precision bent
- Precision cut to length
- Heat Treated
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Gas Rings:
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- Stainless Steel per Mil-Spec
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Ejector:
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- Precision machined
- Heat Treated
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Ejector Spring:
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- Chrome Silicone
- Precision ground ends
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Ejector Retaining Pin:
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- Precision cut to length
- Hard Chrome Plated
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