Got a Suppressor for XMAS? Here’s How To Mount It
David Higginbotham
You got a suppressor for Christmas?! You must have the coolest wife ever. Or maybe this is the equivalent of Homer Simpson buying Marge a ball for her birthday…. Either way, you now have a suppressor, which is never a bad thing. So how do you mount it?
Mounting a Suppressor to a Gun
Let’s cut through the decision paralysis. You know what I’m talking about. It is Friday night, you’re tired but not sleepy, and you open up Netflix, only to spend the next hour staring at all the options. You know you want to watch something, but there are so many choices that you can’t focus and choose.
Choosing how to attach a suppressor doesn’t present the same unending array of options, but you will need to make some nuanced decisions.
You Need a Threaded Barrel
Everything begins with the muzzle of the gun you want to suppress. You need a threaded barrel. If you are still not past this first, fundamental step, you should do some more homework.
You Need a Suppressor, Too
After that, I’m assuming you have a suppressor ready to go, or on the way. Most suppressors are built to be highly adaptable. While a lightweight hunting suppressor, like the Scythe Ti, is ideal for carrying long distances, it is just as capable on a bull-barreled behemoth you shoot from the bench.
Most rimfire suppressors are designed to thread directly onto the barrel of a .22 rifle or pistol. This is about as simple as it gets.
But big-bore cans like the Hybrid 46M are effective across a wide variety of common calibers. With the right mounts, one Hybrid 46M can cover almost everything.
The next step is figuring out what you’ll need to attach the suppressor to the gun. Rest easy; navigating this part is hardly complicated.
Know the Thread Pitch on Your Barrel
You need to know the thread pitch on your barrel. The details are easy to find. Head over to the manufacturer’s website (either for the gun or the barrel itself) and read the specs.
Some measurements are conveyed in standard measurements; others will be metric.
If you happen to have bought the gun second hand, or had the barrel threaded by a professional (and then forgotten the pitch) you can get thread pitch gauges and match the appropriate gauge to the actual threads on the gun. You can find a gauge online or at most hardware stores.
Word of advice. Don’t take the gun into the hardware store to check the thread pitch. This is not socially acceptable behavior. And make sure every gun you handle is unloaded before doing anything with the muzzle end.
How To Read Thread Pitch Dimensions
You may see dimensions written like this: GLOCK® 17 — 9MM 1/2″–28 (AC864) | 5″ length. This means the barrel is for a GLOCK 17, chambered in 9mm, and the barrel measures .5” across and has 28 threads per inch. Note that there won’t be a full inch of barrel threaded. But if there were, there would be 28 threads. Almost all of these notations will have the Nominal Major Diameter (1/2”) and then the Threads Per Inch (28).
Some measurements are downright unamerican, like this one: GLOCK® 19 — 9MM M 13.5 x1 LH. In this case, the barrel is measured in metric units. The M denotes Metric. The diameter of the threaded portion of the barrel is 13.5MM, and the 1, here, means there’s 1MM between the threads. LH notes that the suppressor threads on to the left.
Most barrels sold in the US are threaded to standard pitches, as our republic’s founding fathers intended. GLOCKs, though, and Walthers, FNs, HKs, and many others that have ties to foreign manufacturers, will use metric, or both.
Choose the Right Mount
Once you know your thread pitch, it’s time to pick the mount. Here’s the run-down on the different types.
Direct Thread Suppressor Mounts
Direct thread mounts act as a bridge between the muzzle and the body of the suppressor. The reason why this connector is a separate, interchangeable part is simple: rifles and handguns—even those chambered for the same round—may have different diameter barrels or be threaded to different pitches.
These are the most intuitive attachment method and serve as the primary choice for rimfire firearms and most bolt-action rifles.
I’m a big fan of direct thread mounts as they’re simple and very straight forward. I began shooting suppressed with a Sparrow, which has direct thread mounts. I tend to go direct thread on bolt-actions for hunting. Direct thread is ideal for any scenario that doesn’t require speed.
Understanding Thread Density
You will have to do a fair bit of twisting to get a suppressor seated, and this isn’t fast, but it is hardly complicated.
The strength of this connection depends on surface area; a narrow bore with a short stack of threads provides less metal-on-metal contact for a secure physical bond. To visualize this, imagine unwinding a long thread from its groove and measuring it; a longer total length provides a more secure mount.
Where the direct thread cap attaches to the body of the suppressor, the stack of threads won’t be nearly so tall. But the diameter of this connection is much wider. If you took the thread from my example before, it would be just as long in this short stack because the course of the thread winds around a wider diameter.
Using a direct-thread mount on a suppressor like the 46M involves an endcap that screws onto the suppressor body, with a female thread pattern that attaches directly to the barrel. If you want to change guns, and the new host gun has a different thread pitch, you will need another end cap to match.
Shotguns are the outlier here. Rather than threading the outside of a shotgun’s barrel, most manufacturers thread the inside for the instalation of choke tubes. This is where SilencerCo’s Salvo 12 attaches, so knowing which type of choke tube your gun uses will point you in the right direction. Then you just need to decide on which choke pattern you may want to hunt with.
Thread Over Mounts
Direct-thread mounts attach directly to the muzzle, meaning that when you remove the suppressor, the bare barrel threads are exposed. However, some firearms benefit from having a permanent muzzle device, such as a muzzle brake or compensator, even when you aren’t shooting suppressed.
Thread Over Mounts (TOM) provide this versatility by allowing you to install a dedicated muzzle device that the suppressor then threads over.
ASR for a Faster Lock-Down Connection
SilencerCo’s Active Spring Retention (ASR) Mount is a quick attach/detach system that is almost as easy to understand as the TOM option.
It uses a compatible muzzle device (many of which are actual muzzle brakes) which threads into the ASR locking collar mounted on the suppressor itself. Simply thread it on, then tighten the collar down. The collar prevents the mount from loosening during live fire.
Removing the suppressor is just as easy, as you simply unlock the collar and twist off the suppressor.
3-Lug Mounts for Speed
3-Lug mounts add another element to this connection. The same suppressor, in many cases, can accept a 3-lug mount. But, instead of a single piece that connects the barrel to the body of a suppressor, there is now a muzzle device on the firearm and an adapter on the suppressor that this device indexes into. Keep in mind that 3-Lug mounts are meant for PCCs, and are not recommended on larger rifle calibers.
The system works because there’s a robust spring inside the housing that screws into the bottom of the suppressor body. With three lug mounts, I hardly ever take the muzzle device off. The gun will run perfectly well with one, with or without a suppressor. To attach the suppressor, slide it onto the mount, pull it in and twist.
This action is easier to do than to describe. Three lug mounts are fast. If you want to attach a suppressor quickly, as you might in tactical scenarios, this is an excellent choice.
Three lug attachments for SilencerCo suppressors are available in both Charlie and Bravo pattern mounts.
Understanding SilencerCo Mount Patterns
When researching these mounts, you will quickly encounter terms like “Alpha,” “Bravo,” and “Charlie.” These names refer to the specific thread patterns and diameters used on the back end of the suppressor.
Understanding which category your silencer falls into is essential for selecting the correct Three Lug adapter or direct-thread mount.
| MOUNT PATTERN | THREAD SPECS & DESIGN | PRIMARY USE & COMPATIBLE SUPPRESSORS | KEY DIFFERENCES/NOTES |
|---|---|---|---|
| Alpha | 1.125-28 threads; smallest diameter; supports ASR, direct thread, piston, and 3-lug options. | Pistols and sub-compact setups (e.g., Spectre 9, Omega K Series). | Ideal for pistol calibers; piston-compatible for semi-auto pistols. |
| Bravo | 1.375-24 threads (also called HUB or “Omega” pattern); medium diameter; supports ASR and direct thread. | Lighter-duty rifles and multi-caliber (e.g., Omega 300, Hybrid 46, Scythe-Ti). | Balances size and weight; follows industry-standard HUB pattern for adapter compatibility; excellent choice for ARs or hunting rifles. |
| Charlie | 1.375-32 threads with tapered interface and retaining ring/flange; largest diameter for centerfire; supports ASR, direct thread, piston, and 3-lug. | Heavy-duty/full-auto rifles (e.g., Chimera 300, Omega 36M, Hybrid 46M, Saker series, Velos LBP). | Built for high-volume or severe use (e.g., belt-feds); taper enhances gas sealing and alignment under vibration/heat; more robust but slightly heavier than Bravo. Often paired with multi-caliber cans. |
| Delta | Rimfire direct-thread adapters (various barrel thread pitches). | Rimfire firearms (Sparrow 22, Switchback 22). | Specialized for low-pressure .22 calibers. Simple, lightweight, and direct thread. Not for centerfire. |
| Echo | Tapered choke interface (choke-threaded adapters). | Shotguns (e.g., Salvo 12, Salvo 12K). | Designed for 12-gauge; uses choke-style mounting shotgun barrels; tapered for easy attachment/detachment. |
Mounting a Suppressor to a Handgun
If you have a rimfire handgun, you will use a direct thread mount. Lower powered rounds are easy to accommodate with direct thread, and many rimfire guns have fixed barrels like rifles.
Centerfire handguns, though, are different. The short recoil action in use in most designs requires that the slide moves rearward as the barrel tips up. This motion directs the energy of recoil back into the system that ejects the spent case and loads a new round. Easy enough, when unsuppressed.
Attach a suppressor, though, and the balance in this system can be thrown off. Any added weight might prevent the gun from cycling correctly. But there’s a fix.
Piston mounts (also called Nielsen Devices or boosters) use a spring that rides between a muzzle device and the suppressor body. When the round fires and recoil energy hits, the suppressor will stay in place for a fraction of a second while the barrel moves to the rear like normal.
While it is almost impossible to see without a slow-motion camera, this compression of the spring is the magic that keeps semiautomatic centerfire handguns performing reliably.
Suppressing a Shotgun
Scatterguns present a conundrum for suppressor companies. The first (of many) challenges is mounting. Many shotgun barrels are thin at the muzzle end. Thin barrels preserve balance, and swing easily. But this leaves very little material to cut into for threads.
Instead, barrels are threaded with a wide, flat pattern internally. This is how choke tubes attach and makes for a convenient way to thread in an Echo mount for a Salvo 12. All you need to know is what pattern choke tubes you need and Bob’s your uncle.
Get Shooting
With a modest amount of technical information, and a clear understanding of what you want the mount to accomplish, the decision should be clear.
The last thing to consider is the ease of installation. SilencerCo makes tools dedicated to specific suppressor types, and (even better) tools that are designed to tackle any job.
David Higginbotham
