Picked up a 1.6 mm armory USA receiver over 5 years ago and have decided to use it with a all matching Polish AKM kit. It’s been a complex build so far and is also a rust bluing project as well. Fitting has been quite a to do. Though I still have a little grittiness towards the end of the bolt carrier travel it is feeling pretty good. I was wondering about heat treat? I’ve read that 1.6 mm Armory USA receivers are fully treated to begin with but is this through and through or is it a full surface heat treat? After riveting together the receiver, trimming fitting the rails, ejector and mag well I’m getting close to doing rust bluing cycles and need to know wether I need to spot heat treat my axis pin holes and ejector? Any knowledge and advice about doing a build with a 1.6 mm Armory USA receiver would be greatly appreciated!
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