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Anyone know whether the receiver is high carbon, low carbon, or mild steel?
I tried to search the existing posts and saw someone mention that they
thought it was A336/1008 steel, but I think that was just a guess.

Thanks...this is my first post!
 

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Just your standard run of the mill Cold rolled steel. ;) (i think)
 

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Looking for the right welding rod?
To address your question I don't know, but that might be a better questions to ask of some of the people that build these if that is what you are looking for.
 

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You can try sending a PM to ' ghilliebear2000 ' or ' Bigduke60 ', im pretty sure they both do stuff like this.
 

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I believe the steel is 1018 on a HK receiver 90 series. Clones generally use 1020 due to availability. The steel is low plain carbon. Reason is due to the need to apply many folds in the steel from presses. The receiver moment strength is due to the folds and section modulas. Most of the forces are axially which are repelled due to springs, buffer and enertial from the bolt.
 
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