Afghan rebels were making their own guns for decades, under Third World conditions.
How many frames can an unemployed master machinist make in his basement per week? He doesn't need to make barrels, triggers, or any other part which does not have the serial number -- just the frame. All the other parts can be bought without paperwork.
It just shows the futility of thinking gun control can take guns away from gang members.
And yet here in the U.S., where we have the right to keep and bear arms, we have some of the most restrictive regulations to try to prevent us from exercising that right.