Burt Gummer is one big walking CMoA, though his most defining moment is probably from the first film, when he and his wife Heather are attacked in their bunker by a Graboid. Listening on the radio the others hear Burt yell, "Jesus Christ!" and think it's all over...then a beat later, they hear gunshots echoing across the valley. Cut back to Burt and Heather going to town on the Graboid with their guns. They run out of ammo, and it looks like it's all over for real...then the camera pans over to thegiganticWall of Weapons. Burt and Heather spend a solid two minutes or so blasting the damn thing with increasingly larger guns, with Burt finally taking it down with an elephant gun. He comments "Broke into the wrong goddamn rec room, didn't you, you bastard?" Heather probably would be just as highly regarded if only Reba McEntyre hadn't cut ties with the franchise at that point.
While the basement scene could be regarded as Burt Gummer's most defining moment (in that he gives the term 'gun nut' a whole new meaning), one can't his first encounter with the Shriekers in Tremors 2. We see several instances of the new Graboid mutation having jumped other characters and torn them apart with apparently little resistance. Then we get a brief cut to Burt getting ambushed by the things before cutting away again. The next morning Earl, Grady, and Kate have just survived a Shrieker attack when they hear an ominous rumbling from outside. Thinking it's a Graboid, they brace for another shootout. Instead, Burt's truck appears over the hill, torn completely to hell and half-covered in Shrieker guts. The truck grinds to a halt and Burt steps out, his clothes ripped and covered from head to toe in Shrieker guts, but he is not only alive to tell the tale of fighting off roughly two dozen Shriekers singlehandedly, he doesn't even have a single visible injury to show for the experience. The group asks him if he's all right, and Burt proceeds to deliver what might be the single most awesome line in the entire series:
"I feel I was denied critical...need-to-know...information."
Burt then follows this up with an explanation of how he survived such an assault:
Even better. He's the only person in the entire franchise that could be eaten by a Graboid, survive, and the audience will absolutely believe the plausibility of said survival. It's believable simply because this is Burt Freaking Gummer.
Tecopa from Tremors 4 may have been a one-film character with a scant handful of lines, yet he managed to deduce one of the Graboids' key weaknesses (collisions) and bait one into a fatal headache. And apparently does so on the fly, in less than a minute!
One of the most subtle scenes of Burt Badassery is when Melvin comes running out pretending to be attacked by the dead graboid tongue. Burt nearly shoots him, thinking like the others he is being attacked. When Melvin reveals it is all a prank, Burt goes rushing over and pins him to the ground. What he says next is a CMOA for anyone who has seen a similar lack of gun safety written off in other films and shows that Burt, while a Crazy Survivalist, takes safety seriously.
Twitchell gets one in an episode dealing with a large mutant brine shrimp when he realizes that when they implement their plan to kill the creature, it could just turn tail and swim upstream. He proceeds to jump into his car and drive it off a cliff into the aqueduct, blocking the creature's potential escape route. Up until this point, Twitch had been more of an Obstructive Bureaucrat and The Load.
Nancy gets two when they're trapped in Burt's safe room due to a scientist trying to breed "safe Shriekers" for search and rescue ops. First, she demonstrates that she knows a thing or two about how to make a bomb because she had "radical friends" in the Sixties. Then, when the Shriekers sneak up Burt's escape tunnel, cutting off their escape route, she rips the bomb off of the door that they were planning on using it for, and tossing it down the tunnel with the Shriekers.
Tyler, Larry, and a scientist who had come to study El Blanco manage to stop a a swarm of deadly, carnivorous insects by making a giant fly strip with tar, then barbequing them all with copious amounts of gasoline.
Rosalita gets one for kicking a Shrieker in the face.