50-mm's

Updated: May 21, 2025

He has at least four 50-mm's on the landing stage above, and he has half a dozen heavy machine guns and twice that many light 7-mm's." "Bish is right," somebody else said. "They have the vehicle port on the street level barricaded, and they have the two floors on the level below sealed off.

H. Beam Piper - Four-Day Planet