A thin film of desert dust coated the upper receiver, disturbed by the faint imprint of a thumb much wider than her own.
Furthermore, the tension on the rear takedown pin was fractionally looser than the exact torque she had applied twenty minutes ago.
Evelyn did not gasp, nor did she look around for a culprit.
She simply exhaled a slow, measured breath through her nose as the heavy shadow of Colonel Miller fell across her firing mat.
"Staff Sergeant Carter, the brass is assembled and waiting," Colonel Miller announced, checking his watch against the glare of the sun.
"We are burning daylight, Marine, so let’s see what this updated system can actually do."
Behind the Colonel, a cluster of field-grade officers stood with clipboards, their sunglasses reflecting the harsh Mojave glare.
Just beyond them, Sergeant Marcus Vance leaned against an ammo crate with his arms crossed tightly over his chest.
His posture was meant to project relaxed confidence, yet a bead of sweat traced a rapid path down his sunburned temple.
"Is there an issue with the weapon, Staff Sergeant?" Marcus called out, his voice carrying clearly across the gravel.
"Looked like you hesitated there for a second."
A few of the younger Marines shifted their weight, exchanging quiet, skeptical glances.
Evelyn rose smoothly to her feet, keeping the M110 cradled safely across her chest with the muzzle pointed downrange.
"No hesitation, Sir," Evelyn replied, addressing the Colonel while her cold gaze locked directly onto Marcus.
"In fact, I would like to invite Sergeant Vance to assist me with a live demonstration of the updated pre-fire protocol."
Marcus stiffened, his boots grinding slightly against the packed dirt.
"I’m an operator, Staff Sergeant, not a testing clerk," Marcus shot back, trying to muster a dismissive smirk.
"Step up to the line, Sergeant Vance," Colonel Miller ordered sharply, clearly annoyed by the pushback.
"If she wants a spotter from the resident platoon, you’re it."
Marcus had no choice but to uncross his arms and march forward, his jaw clenched tight.
He stopped three feet from Evelyn’s mat, the smell of gun oil and nervous sweat radiating off his utilities.
"The rumor on the line is that I’m just a librarian from Quantico," Evelyn said, her voice dropping so only the immediate circle could hear.
"And a good librarian always checks the index before opening the book."
With practiced, surgical speed, her fingers popped the rear takedown pin and pivoted the upper receiver open.
Marcus’s eyes darted instinctively toward the bolt carrier group.
"Standard field strip isn’t on the evaluation schedule for this phase," Marcus muttered, his throat sounding remarkably dry.
"Why are you wasting the Colonel’s time checking gear you supposedly already cleared?"
"Because the desert is an unpredictable environment, Sergeant," Evelyn answered smoothly, sliding the bolt carrier group out into her gloved palm.
"Foreign debris has a fascinating way of creeping into a rifle when your back is turned."
She reached into her vest pouch and withdrew a pair of steel armorer’s tweezers.
The metallic click of the tool sounded like a cocking hammer in the dead silence of the range.
Colonel Miller stepped closer, frowning as he peered over Evelyn’s shoulder at the disassembled components.
"What are you looking for, Carter?" the Colonel demanded, his tone shifting from impatience to sharp professional curiosity.
"An anomaly in the locking lugs, Sir," Evelyn said, angling the steel carrier so the harsh sunlight hit the recessed chamber face.
There, nestled deep against the extractor claw, a tiny glint of reddish-gold metal caught the light.
Evelyn delicately pinched the object with the tweezers and lifted it up for the officers to see.
It was a curled shaving of solid copper, precisely wedged to jam the extractor the moment brass expanded under live-fire heat.
"That didn’t blow in on the wind," Colonel Miller growled, his eyes narrowing as he leaned in to inspect the sliver.
"That’s a sheared jacket fragment from a heavy-grain boat-tail round."
"Specifically, from a hand-loaded .300 Win Mag," Evelyn added calmly, turning her head to look straight up into Marcus’s pale face.
"The exact caliber Sergeant Vance was bragging about shooting in his bolt gun earlier this morning."
The silence on the firing line became absolute, stripped of even the rustle of gear.
"You’re crazy," Marcus blurted out, taking half a step back as every officer’s head snapped in his direction.
"Copper fouling happens all the time, Sir, she probably left it in there from her last range session at Quantico!"
"This rifle has a brand-new chrome-lined barrel that has only fired standard M118LR match ammunition since leaving the armory," Evelyn stated without raising her voice.
"More importantly, I coat my takedown pins with a microscopic dab of ultraviolet trace grease whenever I leave a weapon unattended on an unfamiliar range."
She pulled a tiny penlight from her shoulder pocket and clicked it on, passing the purple beam over the rifle’s lower receiver.
A bright, fluorescent smudge glowed vibrantly along the steel frame.
Without saying a word, Evelyn swung the narrow beam of purple light directly onto Marcus’s right hand.
The index finger and thumb of his shooting glove glowed with the exact same unmistakable neon blue.
Marcus stared down at his own hand as if it had suddenly caught fire.
He tried to ball his fist and hide it behind his thigh, but it was far too late.
Colonel Miller’s face darkened to a shade of crimson that rivaled the desert sunset.
"Sabotaging a live-fire weapons evaluation on my range," the Colonel whispered, his voice trembling with barely contained fury.
"Sir, it was just a test to see if she was actually checking her gear!" Marcus stammered, his arrogance completely shattering into panic.
"Save it for the court-martial, Vance," Colonel Miller barked, gesturing sharply to two Range Safety Officers standing nearby.
"Get him off my firing line, strip his range credentials, and confine him to quarters until the Provost Marshal arrives."
Marcus didn’t even try to argue as the two Marines stepped in and escorted him briskly toward the rear vehicles.
The rest of the platoon stood at rigid attention, staring straight ahead, terrified to even breathe too loudly.
Evelyn didn’t watch Marcus leave.
She simply dropped the copper fragment into a clear evidence baggie, sealed it, and reassembled the M110 in less than twelve seconds.
The bolt slammed home with a crisp, authoritative metallic clack.
"Weapon is clear, functional, and ready for the evaluation, Colonel," Evelyn said, dropping smoothly into a prone firing position on the mat.
Colonel Miller watched her settle behind the optic, a slow, genuine nod of respect replacing his anger.
"Carry on, Staff Sergeant Carter," the Colonel commanded, stepping back to give her room.
Evelyn aligned her crosshairs on the steel target eight hundred yards away, let out half a breath, and squeezed the trigger.
The rifle barked once, the brass ejected cleanly into the sand, and the distant clang of a dead-center hit echoed across the quiet desert.
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