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And the right grade of steel, and the ability to precisely heat treat. ARs are easy to make because all the pressure bearing components are non serialized in USA. Those are the hard bits to make safely at home. Europe doesn't care about receivers for that reason, they care about barrels, bolts, trunions, etc. Hence serials on those parts in EU guns. Import AKs tend to have serials on both parts as a compromise to the US system. The S12 and derrivatives got approved using the system from Europe, without any thought towards making them easy to clone or remake. There's no money in that for the m