PROBLEMS:
1. The corrosion of the steel parts. From the barrel to the
stock adapter, there was a surface corrosion which looked
like rusty dirt on the white towel. The symptoms of corro-
sion were found on the bolt, bolt carrier, gas block, barrel,
barrel housing, trigger, screws of the upper receiver and
steel parts in the upper receiver. The corrosion wasn't noti-
ced on the trigger guard, muzzle device, lower receiver pins
and screws, charging handle.
2. The corrosion on the parts of the bolt carrier group: bolt,
bolt carrier, bolt head, firing pin, firing pin retaining pin.
3. Poor treatment of bolt carrier. The plug of the process
hole of the bolt cam pin on the carrier has defective welding
The modified attachment of gas piston guiding rod
The internal parts of gas piston system after tuning
Grot
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Grot
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