BANISH Speed K Truck Gun + Patrol Carbine Suppressor
In This Article
- The BANISH Speed K: The Compact, Bulletproof Suppressor Your Patrol Carbine (or Truck Gun) Has Been Waiting For
- Specs at a glance
- Why truck-gun owners reach for the BANISH Speed K
- Built Like a Tank—Because It Is
- Size Matters, And This One Wins
- Performance That Won’t Fight Your Carbine
- Mounting Versatility That Makes Life Easy
- Why Patrol Carbine Owners Haven’t Thought of This Combo (Yet)
- BANISH Speed K Truck Gun Suppressor FAQ
Last updated: October 10, 2026 · Originally published May 16, 2026
The BANISH Speed K is a 4-inch, 14.1-ounce Inconel suppressor for 5.56 truck guns and patrol carbines: full-auto rated, about 20.9 dB of sound reduction, and an MSRP of $1,129.
The BANISH Speed K: The Compact, Bulletproof Suppressor Your Patrol Carbine (or Truck Gun) Has Been Waiting For
The BANISH Speed K from BANISH Suppressors is a purpose-built, ultra-compact full-auto rated 5.56 suppressor. The Speed K stands out even among enthusiasts who already own a rack full of suppressors even though it only measures in at just 4 inches long and 2 inches in diameter. Being one of the shortest dedicated.223/5.56 options on the market, even with its size the Speed K delivers meaningful sound reduction of around 20.9 dB. Compact in size without the excessive back-pressure penalties that often turn a nimble carbine into a gassy project. Constructed as a monolithic 3D-printed unit from 100% Inconel (with a lighter titanium variant also available), it is full-auto rated, passes rigorous SOCOM-level durability testing. Featuring controlled-flow baffles and a vented fourth baffle that limit blowback to a mere 5.8% increase over unsuppressed fire! Its industry-standard 1.375×24 HUB mount accepts direct-thread adapters (1/2×28 included) or quick-detach systems, making it exceptionally easy to swap between rifles while the tough Cerakote finish and lifetime warranty underscore its no-nonsense design for serious hard-use applications. In short, the Speed K fills a niche many suppressor owners have overlooked: maximum durability and maneuverability in a package that improves, rather than complicates, a patrol-style or truck-gun AR. Short answer: the BANISH Speed K is a 4-inch, 14.1-ounce, 2-inch-diameter Inconel short suppressor on a 1.375×24 HUB mount (1/2×28 adapter included), full-auto rated, delivering 20.9 dB of sound reduction. MSRP is $1,129.
Specs at a glance
| Caliber rating | 5.56 NATO / .223 Rem |
|---|---|
| Length | 4.0″ |
| Diameter | 2″ |
| Weight | 14.1 oz |
| Material | Inconel |
| Mount | 1.375×24 HUB (1/2×28 adapter included) |
| Sound reduction (dB) | 20.9 dB |
| Full-auto rated | Yes |
| MSRP | $1,129 |
Why truck-gun owners reach for the BANISH Speed K
If you’re a law enforcement officer clearing buildings and you run a patrol carbine or even a prepared citizen with a truck gun that lives in the cab. You demand a hard-use carbine that gets banged around, tossed in a trunk, and shot hard. So why would you not demand the same thing of your suppressor? You want a suppressor that quiets things down without turning your reliable carbine into a finicky gas hog, without adding a foot of length that ruins maneuverability, and without worrying it will crack or loosen after one rough shift or range day. Meet the BANISH Speed K from BANISH Suppressors: a 4-inch, dedicated 5.56 suppressor built like it was designed exactly for the rough and tumble life.
Built Like a Tank—Because It Is
The Speed K isn’t just “durable for a suppressor.” It’s 100% Inconel 718, 3D-printed into a monolithic unit that laughs at the kind of abuse a patrol carbine sees. Inconel is the same superalloy used in jet engines and rocket components, a nickel-chromium magic that laughs off extreme heat, corrosion, and repeated high-pressure abuse. Most companies claim their suppressors are tough, But BANISH backed it up: this suppressor passed seven full rounds of SOCOM durability testing (1,400+ rounds of rapid fire per round). Most suppressors fail after one.
That matters for a truck gun or patrol rifle. Picture this: your carbine rattles around in a squad car or pickup bed for months, gets dropped, scraped against door frames during vehicle exits, and then you dump a couple hundred rounds through it in a single training evolution. Heat builds fast on duty guns. The Speed K’s Inconel construction sheds heat dramatically better than stainless or titanium alternatives in high-volume fire, so it stays cooler longer and won’t cook your handguard or optics. Finish it off with a tough black Cerakote and you’ve got a suppressor that looks as good after a year of hard knocks as it did out of the box. (There’s also a titanium Speed K Ti version not full-auto rated at just 8.6 oz for those who prioritize every ounce saved, but for the patrol/truck-gun crowd that wants maximum abuse tolerance, the 14.1 oz Inconel model is the one built for the job.)
Size Matters, And This One Wins
At just 4 inches long and 2 inches in diameter, the Speed K is one of the shortest dedicated 5.56 suppressors on the market. With the direct-thread adapter and you’re looking at roughly 4.25 inches overall. That’s shorter than many brakes let alone a suppressor. Stick it on a 10.5-inch or 11.5-inch Mk18-style barrel and your overall length barely changes, perfect for vehicle work, CQB, or when you’re slinging the rifle around corners or into a patrol bag.
Weight? 14.1 ounces (Inconel). It feels substantial in the hand something akin to like holding a smoke grenade. While it may seem heavier than other suppressors, that mass is exactly what gives it the strength to handle full-auto fire and repeated abuse without batting an eye. The short, fat profile maximizes internal volume for sound suppression in a tiny package, something longer, skinnier suppressors simply can’t match.
Performance That Won’t Fight Your Carbine
Basic suppressor knowledge tells you that most suppressors increase back pressure, turning your soft-shooting carbine into a gassy mess that spits carbon in your face and demands an adjustable gas block or tuned buffer. The Speed K flips the script with its proprietary controlled-flow technology including clipped-wall baffles, a finned blast chamber, and a vented fourth baffle that vents gas forward through five ports at the end. Result? Only a 5.8% increase in blowback over unsuppressed shooting. AND most importantly ARs should run perfectly with zero gas tweaks.
Sound reduction sits right around 20.9 dB. Just enough to knock the edge of the concussive blast of the .556 and not permanently damage your hearing for one or two incidental shots. For extended use a second form of hearing protection like foam plugs should be used as hearing damage can be cumulative. While not the quietest can on the market the Speed K does not sacrifice maneuverability. Full-auto rated, of course. And because it’s a dedicated 5.56 design (not a multi-cal compromise), it’s optimized for the round you shoot on a patrol carbine.
Mounting Versatility That Makes Life Easy
One of the smartest features for real-world users is the industry-standard 1.375×24 HUB mount. BANISH includes a direct-thread adapter (1/2×28). Want to swap between rifles or run a quick-detach system? The HUB lets you use popular QD mounts from other makers, no proprietary nonsense. Thread it on once, torque it properly, and it stays put through rough handling. Perfect when you’re jumping between a duty gun, a loaner carbine, or swapping suppressors between home-defense and truck setups.
Why Patrol Carbine Owners Haven’t Thought of This Combo (Yet)
Most suppressor buyers fall into two camps: lightweight hunters chasing titanium multi-cals or competition shooters with long, quiet suppressors. The Speed K occupies a sweet spot many overlook, which is a short, dedicated 5.56 duty suppressor built for professionals who need it to work every single time, even after it’s been tossed in a trunk and shot hard. It doesn’t scream “range toy.” It whispers “reliable partner. ”Whether you’re a cop running a 10.5-inch MK18 clone, a civilian who keeps a suppressed carbine in the truck for emergencies, or anyone who wants a suppressor that disappears on the gun yet shows up when you need durability, the BANISH Speed K checks every box. Compact enough not to change your rifle’s handling. Tough enough to survive the real world. Quiet and low-back-pressure enough that your carbine still runs like it should. If your patrol carbine or truck gun deserves a suppressor that’s as serious about hard use as you are, the Speed K isn’t just a great option, AND it might be the best one you’ve never considered.
BANISH Speed K Truck Gun Suppressor FAQ
Does the BANISH Speed K work as a truck gun suppressor?
Yes. The 4-inch length keeps a short-barreled rifle easy to handle in vehicle gun racks, behind-the-seat storage and console-mounted retention systems, and the Inconel build is made for hard use.
What is the BANISH Speed K?
A 4-inch, 2-inch-diameter suppressor for 5.56 and .223 short-barreled rifles and truck guns. It weighs 14.1 ounces, is 3D-printed from Inconel, is rated for full-auto fire and gives about 20.9 dB of sound reduction.
Does the Speed K work on .300 Blackout?
No. The Speed K is a dedicated .223/5.56 suppressor.
What thread does the Speed K use?
It uses the 1.375×24 HUB mount, and a 1/2×28 direct-thread adapter comes in the box, so it fits a standard 5.56 AR barrel. HUB quick-detach mounts also fit.
Is the Speed K rated for full-auto fire?
Yes. BANISH rates the Speed K for sustained automatic fire on appropriately rated short-barreled hosts.
Will a short rifle with the Speed K fit a vehicle gun rack?
Usually. Racks designed for 16-inch carbines fit most short-barreled rifle and Speed K combinations, but check your own rack’s clearance before you count on it.
How much does the BANISH Speed K cost?
MSRP is $1,129. The federal tax on a suppressor transfer has been $0 since January 1, 2026, so the price is the suppressor plus any dealer fees.
Do you still need a Form 4 for the Speed K?
Not federally. Since October 9, 2026, ATF no longer enforces the Form 4, registration or tax stamp for suppressors nationwide. A dealer still runs a Form 4473 and background check, and your state’s law still applies. Check your state on our suppressor laws by state page.
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