ViShooter web page shows: 1934 Jan 1 - 1441812
1935 Jan 1 - 1491532.......so, yes.....Approx 50K units.

Pats.....Receivers, barrels, stocks...just about everything.....were available for sale to the civilian market. Maybe some of those sales are absorbed into the 50K???? At least the receivers.
One would think that more detailed records might be kept. maybe they were, but lost or discarded?