Latest research from fully automatic gun ranges show that stamped recievers give out at lower round counts before milled. If it can out last the barrel, thats the most important thing. Spesiba Rob
The milled receiver is more costly and time consuming are the main driver in countries going with a stamped.
Milled receiver will cost you $300+ and will take 3 to 4 hours to be milled per.
Stamped receiver will cost you $50+ can be stamped out and complete in 15 minutes per.
In my opinion the Red Army back in the mid and late 40's had planned for the weapon to be manufactured quick and cost affectly. If are arming a army of 1 million at $150 each, it's way cheaper then the same 1 million at $500 each. It would have save them millions of Rubles
And Rob, the stamped recievers come in heavy duty (1.5mm) w/ heavy trunion. OPAP for example. They are heavier, though. Thanks Rob, you da bomb!!!