With literally hundreds of suppressor mounts on the market, it can be difficult to narrow down the right choices for you. In this video we’ll provide a high-level overview and then we’ll cover the JK Armament options.
Most suppressor-ready firearms feature a threaded muzzle, which means there are screw-type threads machined into the business end of the barrel. A suppressor can screw directly onto these barrel threads, or a mount that accepts a suppressor can be installed on the barrel threads.
Let’s briefly cover the four main types of mounting systems, direct thread, quick attach, pistol booster, and 3-Lug:
If you screw your suppressor directly onto the barrel, that’s called a direct thread mount. JK 105 and 155 series suppressors are compatible with direct thread mounts and some models ship with one. A direct thread mount is the simplest, most straightforward option and it’s also the most budget-friendly option allowing you to move one silencer between multiple guns.
Different calibers have different thread sizes, but one direct thread mount in 1/2×28 size and one in 5/8×24 size will cover a massive list of common calibers from 22 LR to 9mm to 223/5.56 to 308 Winchester, 6.5 Creedmoor, 300 Blackout, and many more.
A direct thread mount stays installed in the base of the suppressor and moves with the suppressor as you move it between firearms. Swap the mount out as necessary to match its thread size with the barrel you’re putting it on.
With quick attach (QA) systems, also commonly referred to as quick detach (QD) systems, a muzzle device such as a muzzle brake, compensator, or flash hider is securely installed onto the firearm’s threaded barrel and is not intended to be removed.
The outside of this muzzle device interacts with the inside of the mount in the base of the suppressor, and through varying mechanisms allows the suppressor to be attached and removed rapidly. This is the best system for quickly moving a suppressor between multiple rifles or for situations in which the suppressor is removed for transport or storage and then needs to be deployed quickly.
For instance, while a direct thread system may require the suppressor to be turned 20-or-more times in order to screw it down onto the muzzle threads, an QA mount that involves screwing the suppressor on will likely only require 4 or so rotations.
Semi-automatic pistols employing a Browning-style recoil-operated mechanism, which is the vast majority of them (effectively all of them if the barrel isn’t pinned in place, which is more typical of a straight blowback operation), require a pistol booster (AKA a Nielsen Device) if the suppressor weighs more than approximately 4.5 ounces. This is because a suppressor that’s heavier than that impedes the necessary movement of the barrel, which causes the pistol to malfunction.
Inside of a pistol booster is a piston and a spring. When the pistol is fired, the barrel moves and pulls the piston along with it, compressing the spring. The suppressor’s inertia keeps it effectively still during this process. Then, approximately when the pistol’s slide is at the rearmost point in its travel, the booster spring begins pulling the piston and suppressor back together and finishes that process before the pistol’s slide returns all the way forward. It’s now ready for the next shot.
As the piston is the component that screws onto the pistol’s barrel threads, its thread pitch is what has to be matched to the barrel. One pistol booster can be used on pistols of many calibers by swapping the piston out for the correct thread size. In most cases, 9mm pistols are threaded 1/2×28, and .40 cal, 10mm, and 45 ACP pistols are most commonly threaded .578×28.
A 3-Lug or Tri-Lug system is a QA / QD system used almost exclusively for pistol calibers on fixed barrels. So submachine guns (and semi-automatic variants thereof), PDWs, pistol caliber carbines, etc.
On the firearm side, three lugs are machined into the barrel by the muzzle. On the suppressor side, a 3-Lug adapter is installed into the base of the suppressor and it contains three grooves. Internally there’s a collar with a spring that provides tension on the system and keeps it locked in place.
To install the suppressor, the grooves and lugs are aligned, the suppressor is pushed onto the barrel hard enough to compress the spring inside of the 3-Lug mount, and then it’s rotated approximately 90 degrees clockwise and released. The internal spring pushes the suppressor forward, maintaining pressure against the barrel lugs that keeps them locked into internal recesses. Removing the suppressor involves reversing the process: press it toward the firearm to compress the spring, rotate it counterclockwise until it stops, and pull it off the front.
3-Lug systems are extremely fast and simple to use. Typically speaking they aren’t robust enough and don’t seal up gasses well enough to use them on centerfire rifles, but they’re great on pistol caliber guns.
The JK 155 Booster/3 Lug Adapter is a handy, precisely-manufactured thread adapter ring! It’s made to adapt your favorite pistol booster or 3 Lug mount to your JK 155 suppressor or to any other industry standard HUB mount 1.375×24 TPI (1-3/8×24 TPI) threaded suppressor.
Machined from 7075 billet aluminum and Type III Hardcoat anodized, the JK 155 Booster/3 Lug Adapter comes in three internal thread sizes to fit pistol boosters and 3 Lug mounts from many different companies (see compatibility list below).
(1) JK 155 Booster/3 Lug Adapter
1.203-28 TPI Adapter
- DEAD AIR KEY-MICRO ADAPTER
- Dead Air 3 Lug Mount
- Dead Air Booster
- Liberty 3 Lug Mount
- Gemtech 3 Lug Mount
- SD Tactical Arms 3 Lug Mount
- Liberty Booster
- Gemtech LID Booster
- SD Tactical Arms Booster
- MMW Reflex OTB Mounts
- Silencerco Octane 3 Lug Mount (AC2447/AC2448)
- Silencerco Alpha ASR Mount (AC2632)
- Griffin Plan A (TMA1125x28)
- Griffin A2 Optimus Blast Sheild
- Area419 Hellfire Mount (Harvest Option)
JK Armament Options:
Compact and incredibly lightweight, the JK 105 series of suppressors ships with a direct thread mount, which is currently the only available type of mount for it. Whether you’re shooting any rimfire caliber, 5.7x28mm, or 9mm carbines or pistols, effectively all of those firearms will have a 1/2×28 threaded barrel. Because the 105 series is so light, it will run reliably on nearly any pistol without the use of a booster.
Most JK 155 series suppressors ship with a JK Taper Mount installed. This mount provides QA capability onto JK 155 series muzzle devices such as the War Eagle and Bald Eagle. If you want to remove the Taper Mount to use a JK Armament direct thread mount, pistol booster, 3-Lug mount, or even a mount from another manufacturer, please note that the Taper Mount was installed by us with the use of some removable loctite. The easiest way to remove it is to heat it up to approximately 350 degrees with a heat gun or oven – or have a little extra fun on the range! – before unscrewing it with standard 1.5” wrenches. Don’t burn yourself.
Our 155 series suppressor tubes are threaded in the industry standard HUB 1.375×24 (1-3/8×24) thread size. This means hundreds of mounting systems from dozens of manufacturers are available for and compatible with the JK 155 series.
WARNING: if you use another company’s mount, make sure it’s a quality mount from a trusted manufacturer. Flawless alignment of the suppressor bore with the barrel bore is critical, and small errors in concentricity and manufacturing tolerances in the mount can cause bullets to impact the inside of your suppressor, which can cause catastrophic failure. A bore alignment rod can be used to double check correct alignment prior to shooting. Then again, you could just use JK Armament’s excellent mounting solutions.