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On the HK416 manual, it said that the HK416 has improved bolt head, extractor and extractor spring. What improvements do they have over standard AR-15 components? Thanks.
 

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The bolt diameter is thicker then a DI bolt, all of the corners/angles/joints are better radiused, and the alloy is superior.

DI bolt = .512 OD at the cam pin
and .101 wall thickness at cam pin

HK bolt = .53 OD at the cam pin
and 1.11 wall thickness at cam pin.
 

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you mean .111
No, I mean 1.11. The thing is over an inch thick. When they said it was enhanced, they really meant ENHANCED.




Ok, yea, you're right....my bad. .111 it is...... :)
 
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