Note. To the best of my knowledge this is not based on any existing Fallout Equestria storyline, nor does it follow any particular plot in Fallout 4. This is just the narrative that popped into my head as I was drawing.
 
Two raiders peered at the demolished remains of a wartime armored personnel carrier. Inside their prey had taken shelter. Two mares had sought refuge inside the carcass of the former vehicle. Even after 200 years the armored sides of the APC resisted the raiders projectiles.
 
There was a third mare who was annoying the raiders with her rifle fire from behind a ruined brick wall. But for the moment these two chose to ignore the periodic bursts of gunfire.
 
“Gah! Fuck! I can’t see them!” The unicorn mare cautiously peered around the edge of the burned out dumpster. “Hey Lash can you see them in there?”
 
The earth pony stallion spat a chicken bone out on the ground and then wiped his mouth on the sleeve of his filthy, tattered long sleeve shirt. “Nah! Kent see dem here. Maybe ef…”
 
Casually he leaned his head around the corner of the dumpster. A fraction of second later there was a solid thunk sound instantly followed by a sick, melon being crushed sound as much of the stallion’s head erupted out the back of his skull.
 
“Fuck a zebra!” The mare hunkered further behind the dumpster.
 
The interior of the open top APC had suffered as much as the exterior had over the last 200 years. A thick layer of debris covered floor of the now dead vehicle. The interior smelled of rust, old urine, not so old fecal material, dried blood, gunpowder, and stale beer.
 
Marble Pie slowly lowered the bolt-action and carefully worked the action. A spent 45ACP shell casing ejected from the rifle and landed at her feet. She continued to peer out of what had once been the home for a piece of thick, armored glass. However the windows in the vehicle had long since either been scavenged or destroyed.
 
Maud Pie peered carefully out of another opening in the hull as she loaded 12ga shells into her pump action shotgun. “Good shot Marble.” The mare said in her usual, monotone voice.
 
“Mhmm.” Said her sister.
 
Another burst of gunfire from the direction of their other sister harassed the raiders in the ruins of the former diner.
 
“Well.” Maud said as she racked the pump of her shotgun. “Limestone is keeping them entertained.”
 
“Mhmm.” Marble once again raised her rifle and took aim. A second or so later there was a muffled thunk as another subsonic projectile was launched from the suppressed rifle. A raider who’d popped up on the roof of the diner screamed and clutched his groin as a 230gr projectile burst his testicles like a couple of little water balloons. He’ll toppled off the roof in a heap.
 
“That shot was a bit low.” Maud noted with an almost bored look on her face.
 
Marble once again worked the action of the rifle. “Mhmm.”
 
The rifle Marble is using is a DeLisle Carbine. Ian at Forgotten Weapons did a video of it a couple of years. Link