Your military submarine is boarded by enemy troops after a fierce sea battle. The fighting is happening inside the narrow hallways. Which gun do you use?

Is an open-top slide design better for clearing stuck empty casings than a closed ejection port?

The iconic MP5 design relies on a unique roller-delayed blowback system, originally adapted from a German WWII rifle prototype (the StG 45). While most modern submachine guns use simple blowback, this sophisticated mechanism keeps the bolt locked just long enough for gas pressure to drop, giving it legendary accuracy and minimal recoil.

You are tasked with protecting a VIP diplomat walking through an unpredictable, hostile crowd in a foreign city. Which firearm do you choose for personal security?

Is a cross-bolt safety button easier to use quickly than a thumb-flipped lever on a shoulder weapon?

Your convoy is ambushed in a tight mountain valley by enemy fighters firing down from high cliffs. You need heavy, rapid firepower. Which primary rifle do you choose?

Is a hydraulic buffer system inside the stock better for reducing automatic fire vibration than a simple spring?