What is the round size?

What is the round size?

• A. 25mm
• B. 20mm
• C. 30mm
• D. 40mm

Answer: (B)

Round size is the diameter of the projectile the gun is designed to fire, usually called caliber, and here it’s given in millimeters. The system in question is built to handle a 20mm round, which means the barrel, chamber, and feed mechanism are sized to fit and operate reliably with that diameter. Larger diameters—like 25mm, 30mm, or 40mm—would not fit the chamber or feed correctly in this setup and would require a different weapon or mounting. So the round size that fits this system and its operation is 20mm.

Round size is the diameter of the projectile the gun is designed to fire, usually called caliber, and here it’s given in millimeters. The system in question is built to handle a 20mm round, which means the barrel, chamber, and feed mechanism are sized to fit and operate reliably with that diameter. Larger diameters—like 25mm, 30mm, or 40mm—would not fit the chamber or feed correctly in this setup and would require a different weapon or mounting. So the round size that fits this system and its operation is 20mm.