Suppressed FN Five-seveN: Inside the Twin Falls Carry Setup

On Saturday, August 1, 2026, a gunman opened fire at and around a newly opened In-N-Out Burger in Twin Falls, Idaho. Three people were killed, including an In-N-Out employee, and seven more were wounded. Twin Falls police identified the shooter as 24-year-old Chad Williams, who was armed with a rifle and who died of a self-inflicted gunshot wound. Investigators believe he acted alone and have not released a motive.

Two people returned fire. One was an off-duty Idaho State Police trooper, whom police have not named. The other was Jordan Salinas, 35, a healthcare worker from Kimberly who is the full-time caregiver for his brother, and who identified himself publicly afterward. Neither of them shot Williams to a stop. Williams broke contact, left the scene, and killed himself. Twin Falls Police Chief Matthew Hicks put the effect of their actions plainly: they “helped drive the suspect away from the scene, preventing further casualties.”

A third armed man, Austin James, ran toward the gunman without drawing his own firearm, a decision his father said was meant to keep responding officers from mistaking him for the attacker. He was shot and critically wounded at close range. He is among the seven injured, and he did not fire.

That distinction matters for anyone reading this as a gear story. The measurable outcome here was diversion, not a decisive hit. Two armed defenders forced a shooter to stop shooting at people and start reacting to incoming fire, and the attack ended shortly after. Salinas described his own decision-making in an interview as observing, orienting, deciding “OK, this is the guy,” and then acting. Everything below is about the equipment that was on him when that happened, and what it costs to assemble that equipment today. It is not a critique of any decision anyone made in that parking lot.

Salinas has published pistol and carbine training clips on YouTube for years under the channel name Poverty Operator, and those videos are the first-party record of his setup that we located. Across that footage the host gun is consistent: a USG-pattern FN Five-seveN, the fixed-sight configuration that preceded the current MRD model. His own video descriptions name it directly, including a February 2026 clip captioned as a “B&T suppressed FN Five-seveN USG.”

The suppressor changed over time, and this is where secondhand accounts have gotten muddled. An October 2024 desert drill is described by Salinas as being shot “with the Tactical Solutions Axiom suppressor firing Vanguard's 55gn FMJ subsonic ammunition.” From mid-2025 forward, his descriptions consistently name a B&T can instead, through the most recent clips in early 2026. His published footage therefore confirms two different suppressors on the same host across two years. Which one was on the pistol on August 1 has not been established, and nothing in the footage settles it.

The carry rig is the one detail confirmed by news reporting rather than by the videos: Salinas was described as carrying the suppressed Five-seveN strapped by the shoulder. The specific holster model, the optic, and the ammunition he had loaded that day have not been confirmed by any source we can verify, and social media identifications of those items should be treated as unconfirmed.

Yes, if you feed it a purpose-built defensive load and accept the cost. The strongest argument for 5.7x28mm as a defensive cartridge is not terminal ballistics, it is that the gun holds 20+1 rounds in a grip most hands can still wrap, and it recoils so little that fast, accurate follow-up shots are easier than with a service 9mm. FN's own defensive load, DFNS SS200, drives a 30gr jacketed hollow point at 1,894 fps for 239 ft-lbs from a Five-seveN's 4.8-inch barrel, and FN states the load meets the FBI test protocol.

The honest weaknesses are ammunition-shaped. DFNS lands around $0.81 per round in 50-round boxes, which is expensive next to mainstream 9mm carry ammunition, and the 5.7 defensive selection is a handful of loads rather than dozens. The performance gap between a real 5.7 defensive JHP and 5.7 range FMJ is also much wider than the equivalent gap in 9mm, because the cartridge leans on a light bullet upsetting at high velocity. FMJ 5.7 is a training round, not a carry round. Our ranked breakdown of 5.7x28mm ammunition covers measured velocities and per-round cost across the current defensive and range loads.

Against 9mm the comparison is a trade, not an upgrade. A 9mm defensive round works through a heavier, wider wound channel at roughly 1,100-1,250 fps; 5.7 works through velocity and expansion with a fraction of the bullet mass. If you want the highest-capacity handgun that a recoil-sensitive shooter can run well, 5.7 has a real case. If you want the cheapest practice, the widest ammo selection, and the deepest body of terminal data, 9mm still wins. The full field of current guns, from the $400 KelTec PR57 up, is ranked in our best 5.7x28mm pistols guide.

Start with the barrel, because the current Five-seveN MRD SKUs ship unthreaded. Threading a Five-seveN means an aftermarket barrel, and the FN 5.7 thread standard those barrels follow is a metric M10x1.0 RH pitch rather than the 1/2x28 used on most American 5.7 and rimfire cans. EFK Fire Dragon, Jarvis, and B&T all build M10x1.0 barrels that fit MK3/MRD and earlier guns including the USG. That single spec drives the whole build, and it is the most common thing people get wrong when they plan a suppressed Five-seveN.

Path one is an adapter. An M10x1.0-to-1/2x28 adapter, sold on its own or bundled with EFK's threaded barrels, lets you mount the large existing pool of 1/2x28 cans rated for 5.7x28mm. The Tactical Solutions Axiom is the reference point there and the can Salinas named in his 2024 footage: 6 inches long, 1.00 inch in diameter, 6 ounces, titanium baffles in a patented split-tube design, rated from .22 LR through 5.7x28mm, $499, and built in Boise. The adapter adds a joint to the stack and a small amount of length, and it needs to be checked for tightness the way any threaded interface does.

Path two skips the adapter. B&T builds a 5.7 suppressor that threads directly to a 10x1mm barrel: 8 inches, 1.4 inches in diameter, 12 ounces, sold with a match-grade 10x1mm barrel made to B&T's spec, and introduced at about $700 for the can. B&T is FN's preferred suppressor OEM in Europe, which is how a European metric thread and an American suppressor ended up matched without an adapter. The tradeoff is obvious in the numbers: twice the weight and two more inches of overhang than an Axiom, hung off the muzzle of a pistol you intend to carry.

Weight is the reason suppressed pistol carry stayed a novelty for so long. Six ounces of Axiom on a 25.2-ounce Five-seveN is a manageable penalty; twelve ounces of B&T is close to a 50 percent increase in muzzle-end mass. Either way the holster has to accommodate the can, which is why shoulder and chest rigs show up in suppressed carry far more often than appendix setups. Our pistol suppressor setup guide covers height-over-bore, sight clearance, and the booster question that governs whether a tilting-barrel host will even cycle. For the full field of cans rated for the cartridge, the Axiom included, our best 5.7x28mm suppressors guide ranks eleven of them by host fit, weight, and price.

Twin Falls is the most widely reported civilian defensive gun use involving a suppressed pistol since the federal economics of suppressor ownership changed. The One Big Beautiful Bill Act zeroed the federal making and transfer tax on suppressors, short-barreled rifles, short-barreled shotguns, and AOWs effective January 1, 2026. There is no $200 stamp on a can anymore. At the same time, eForm 4 approvals have compressed to a matter of days to a couple of weeks, which removes the other half of the historical deterrent.

What that does to a build sheet is straightforward. A suppressed Five-seveN is now the pistol, a threaded barrel, and either $499 for an Axiom plus a thread adapter or the B&T can and barrel kit. The line item that used to make people abandon the idea, $200 to the federal government plus most of a year of waiting, is gone. Suppressors remain legal to own in 42 states, Idaho among them.

None of that deregulated anything. A Form 4, fingerprints, photos, NFA registration, and a background check are all still required, and the suppressor is still a registered item that has to be transferred through a dealer. If you have not been through the process, our how to buy a suppressor guide walks the current eForm path start to finish. The practical read on Twin Falls is not that suppressors are newly permissible. It is that a category of setup which used to be a range toy for people with patience is now something an ordinary person can assemble in a couple of weeks, and at least one ordinary person was carrying one.

The 5.7x28mm category has been expanding for three years and the expansion has moved downmarket. FN's Five-seveN was the only game in town at a four-figure price for two decades; the field now runs from the KelTec PR57 through the Ruger-57, PSA Rock 5.7, and S&W M&P 5.7, and FN itself has repositioned the Five-seveN MRD as the premium benchmark rather than the only option. Ammunition followed, with FN adding DFNS and GUNR as dedicated defense and range lines.

The carbine side matured at the same time, which matters because 5.7 gains the most from a longer barrel. FN DFNS climbs from 1,894 fps in a pistol to 2,240 fps from a PS90. Smith & Wesson brought the folding-carbine format to the cartridge with the M&P FPC 5.7, which shares magazines with the M&P 5.7 pistol and arrived alongside Gemtech's 3D-printed titanium Nebula suppressor built for the cartridge. A cartridge with a $400 entry pistol, a folding carbine, factory defensive ammunition, and purpose-built suppressors is no longer a niche.

Three people were killed in Twin Falls on August 1 and seven more were wounded. Nothing about the equipment changes that, and no gear analysis should be read as a tidy ending to it. What the equipment does tell us is narrower and worth stating precisely: a suppressed 5.7 pistol, a configuration that until recently meant a $200 stamp and most of a year of waiting, was on a healthcare worker in a burger restaurant parking lot in Idaho.

If you are looking at that setup, the buying decisions are the ones covered above. The host is the constraint, because a Five-seveN needs an aftermarket threaded barrel first, and the M10x1.0 standard those barrels use then dictates either an adapter or a can built for the metric pitch. The ammunition is the other constraint, because 5.7 rewards a real defensive JHP and punishes the assumption that range FMJ is close enough. Start with the current 5.7 pistol field, pick the load from our 5.7 ammunition ranking, and budget the suppressor as the can plus a transfer rather than the can plus a stamp.