Recently ordered a couple of Polish Blanks for an AK build.
Both were heavily Belt Sanded on all the flat surfaces and the ends were visibly curved as the part was obviously not applied or removed from the Belt Sander evenly.
Measured random parts and some spots were as low as .024".
I for one would not use a Belt Sander on sheet metal. In particular on Firearm components and especially on thin Sheet Steel.
Has anyone else who bought these Blank receivers had Belt Sanded ones ?
The ones I got from Curtis, at AK Builder were perfectly clean, unsanded and pristine, as is typical of his stuff, but he ran out of stock at one point, so I ordered a couple elsewhere.
Advice/opinion please . Go ahead and Heat treat or return ? , or get a refund. Safety is paramount.