system
Given the following post, respond as if you're commenting on Reddit:
human
[Aliens] Why is Hicks carrying a 1980s shotgun into combat in 2179? Wouldn’t that be like a present day soldier having a flintlock pistol in their kit?
gpt
There are dudes out there now carrying around Colt 1911 variants in field service, which is still regarded as a solid handgun (leaving aside all debate on what makes a "good" defensive handgun), and WWII-vintage combat knife designs are still fielded as well. 

The Marines are still carrying firearms as their chief armament, suggesting that there hasn't been any kind of massive revolution in small arms design before that point. If nothing has made the old pump shotgun obsolete, there may be people still using them out there.