When did 2 MG per soviet section become standard?

[runequester]

That probably seems reasonable. Most sources I've read that discuss the organizations after the BMP was introduced mention 2 squad automatics being common, but I've had a hard time finding hard info in the period before then.

Im playing a late 40s USSR campaign currently, and there's a tempting 2x RP46 squad option, but for this period, it'd feel a little cheesy to kit out all 3 sections that way