4130 vs. 8620

The material choice of American manufactures for AK Blanks Receivers and Flats has always been 4130. It is an excellent alloy steel its incredibly strong and relativley lightwieght. The 4130 name is denoted from the specific formulation of the steel as is the case in most steel blends. 8620 alloy is the alloy used for the Polish Blanks that are commonly availble from a varitety of sources and presumably most other original ak receivers used this material as well. 8620 is also a very, very, very strong and lightwieght material as well. OK so they're both plenty strong, however 4130 does have the edge in strength and also a bigger reason why 4130 is used so commonly is its ease in heat treatme

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