Big Gun, Quake Wiki

Destroying the BIG GUN - Quake 2 Walkthrough Gameplay Part 3

Quake (video game) - Wikipedia

Nailgun (Q1), Quake Wiki

BFG10k (Q2), Quake Wiki

Unit 6, Quake Wiki

Quake II: Big Gun Unit / Recap - TV Tropes

Quake II - Wikipedia

Quake II/Big Gun — StrategyWiki

VGJUNK: THE CREATURES OF QUAKE

Quake II - Unit 7: Level 1: Big Gun

Railgun (Q2), Quake Wiki

Quake II - Wikipedia