SureFire Fast-Attach Mount: How It Works and What Fits
Fast-Attach is SureFire's quick detach system. A SureFire flash hider or brake on the barrel, and a SOCOM or RC2 can that slides over it and locks with a half turn of its ratcheting ring. See it in 3D and the devices in stock.
Quick answer
- Fast-Attach (SureFire): SureFire's Fast-Attach: the can slides on and a ratcheting lock ring pulls it tight.
- The GunPartPicker catalog lists 14 Fast-Attach mounts and adapters and 13 cans that ship on Fast-Attach in stock right now.
- Fast-Attach cans only seat on Fast-Attach mounts. None of the quick detach systems interchange.
Source: GunPartPicker catalog and build data, prices checked October 28, 2026.
How the Fast-Attach mount works, in 3D
Pick a system. Drag to turn it, take the can off to see the mount, or cut it open to see the threads, the taper and the baffles. Try a can from another system to see why they don't swap.
Fast-Attach mount + SureFire SOCOM RC2SureFire · 1/2x28
- Mount
- Fast-Attach (SureFire)
- Suppressor
- SureFire SOCOM RC2
- Barrel
- 11.5" SBR
- Mount adds
- 2.1", mostly in the can
- Rifle, no can
- 30.8" overall
- With the can on
- 36" overall
Overall length with the M4 stock extended. With the Fast-Attach can builders add most, the SOCOM556-RC3 Rifle Suppressor Black, whose listing gives no length, counted at a typical 6.5".
- No can, 5.56 AR165 dB
- Dead Air Sandman X142 dB−23
- SureFire SOCOM RC2137.7 dB−27
- SilencerCo Velos LBP137.1 dB−28
- SilencerCo Omega 300130.1 dB−35
- HUXWRX Flow 556Kno published figure
Dashed line: 140 dB, the peak OSHA and NIOSH set for unprotected impulse noise. Every 10 dB is ten times the sound energy. Even suppressed, a short 5.56 sits near or above the line, so keep hearing protection on. Makers meter at the muzzle or at the ear, on different barrels; each row says how: No can, 5.56 AR about 165 dB from a 16" barrel; an SBR's shorter barrel is louder still; Dead Air Sandman X at the muzzle, 10.3" Mk18, MIL-STD-1474E (139 dB at the ear); SureFire SOCOM RC2 at the shooter's ear, 10.3" barrel, M855 (134.7 dB from 16"); SilencerCo Velos LBP muzzle average, 5.56 NATO, host not stated; SilencerCo Omega 300 muzzle average, 5.56 NATO, host not stated; HUB rear, also sold direct thread; HUXWRX Flow 556K hUXWRX publishes no dB figure; its pitch is less gas back at the shooter.
SureFire's Fast-Attach: the can slides on and a ratcheting lock ring pulls it tight.
- On the barrel
- A SureFire flash hider (SF3P, SF4P), brake or WarComp on the barrel threads.
- On the can
- A SureFire SOCOM or RC2 rear with a ratcheting lock ring and a release latch.
- How it locks
- The can slides over the device and its index slot drops onto the device's tab, so the can itself doesn't turn. Turn the lock ring about half a turn until it clicks; it pulls the can tight on the taper and the ratchet keeps it there. Press the latch and turn the ring back to take it off.
- Mount cost and length
- About $110 to $200 a mount, which sits about 2.1" past the barrel shoulder, mostly inside the can.
Why people pick it
- Proven on military and police rifles for years
- Real flash hiders and brakes double as the mount
- Fast on and off by feel
What to know first
- Only SureFire cans fit
- Heavy for what it is
- Pricier mounts than most
Cans on it: SureFire SOCOM556-RC2; SureFire SOCOM762-RC2; SureFire SOCOM556-Mini2.
Fast-Attach mounts for 1/2x28 barrels
1/2x28 fits 5.56, .223, .22 LR and most 9mm.
Ranked by what builders add most, in stock first. One listing per model.
Suppressors on Fast-Attach
| Can | Length | Weight | Sound | Rifle with it on | Price |
|---|---|---|---|---|---|
| SOCOM556-RC3 Rifle Suppressor Black | n/a | n/a | n/a | n/a | $1709 |
| SF SOCOM556-RC4-BK SUPPRESSOR G4 5.56 BLK | n/a | n/a | n/a | n/a | $1472 |
| Surefire SOCOM556 Mini Gen2 Suppressor, Black - SOCOM556MINI2BK | n/a | n/a | n/a | n/a | $1196 |
| Surefire SOCOM300 Gen2 Suppressor, Black - SOCOM300SPSBK | n/a | n/a | n/a | n/a | $1169 |
| Surefire SOCOM556-RC2, 5.56mm, FDE, Suppressor | n/a | n/a | n/a | n/a | $1169 |
| SureFire SOCOM MINI RC4 5.56 NATO Suppressor | n/a | n/a | n/a | n/a | $1377 |
| SF SOCOM556-RC4-DE SUPPRESSOR G4 5.56 DE | n/a | n/a | n/a | n/a | $1472 |
| Surefire SOCOM762 Gen2 Suppressor, Black - SOCOM762RC2BK | n/a | n/a | n/a | n/a | $1214 |
From each listing; n/a means the listing doesn't say. Sound is the maker's figure: a reduction (-30 dB) or a meter reading (134 dB). Rifle with it on: an 11.5" SBR, M4 stock extended.
Ranked by what builders add most, in stock first. One listing per model.
What are the suppressor mount types?
Five quick detach and thread-on systems carry most rifle cans, plus plain direct thread. Each one is a part on the barrel and a matching part on the can.
| System | Maker | On the barrel | On the can | Mount price |
|---|---|---|---|---|
| Direct thread | Open standard | Nothing. The barrel's own muzzle threads, with a thread protector when the can is off. | Female threads in the rear cap, cut to the barrel's pitch, or a direct thread HUB adapter. | None |
| HUB 1.375x24 | Open standard | Whatever the adapter on the can calls for: barrel threads, an ASR mount, a KeyMo mount or a taper mount. | A removable rear cap (the HUB adapter) on 1.375x24 threads. | $60 to $180 |
| ASR | SilencerCo | An ASR flash hider, brake or mount on the barrel threads. | An ASR rear mount (or ASR HUB adapter) with a spring loaded lock ring. | $90 to $150 |
| KeyMo | Dead Air | A KeyMo flash hider, brake or mount on the barrel threads. | A KeyMo rear mount (or KeyMo HUB adapter) with a spring detent ring. | $80 to $140 |
| Fast-Attach | SureFire | A SureFire flash hider (SF3P, SF4P), brake or WarComp on the barrel threads. | A SureFire SOCOM or RC2 rear with a ratcheting lock ring and a release latch. | $110 to $200 |
| HUXWRX QD | HUXWRX | A HUXWRX QD flash hider, brake or mount (the old OSS style) on the barrel threads. | The QD interface built into the back of a Flow can. | $90 to $160 |
Will my suppressor fit another brand's mount?
Almost never. Read across from the can to the mount on your rifle. HUB cans are the exception: swap the rear adapter and the can changes systems.
| Your can | Bare threads | ASR mount | KeyMo mount | Fast-Attach mount | HUXWRX QD mount |
|---|---|---|---|---|---|
| Direct thread can | Fits | No | No | No | No |
| HUB 1.375x24 can | HUB adapter | HUB adapter | HUB adapter | No | No |
| ASR can | No | Fits | No | No | No |
| KeyMo can | No | No | Fits | No | No |
| Fast-Attach can | No | No | No | Fits | No |
| HUXWRX QD can | No | No | No | No | Fits |
That's why the can comes first. Pick it, then put its mount on every rifle it will ride on. A mount is about a tenth the price of a can.
What thread pitch does a suppressor mount need?
The mount threads onto the barrel, so it's cut to the barrel's pitch: 1/2x28 on 5.56, .223 and .22 LR, and 5/8x24 on .308, .300 Blackout, 6.5 Creedmoor and other .30 and 6.5mm rifles. The can side is the same for both, so one .30 caliber can rides a 5.56 rifle and a .308 rifle with the right mount on each.
Never put a 5.56 can on a .30 caliber barrel. The bore is too small for the bullet.
How do you install a suppressor mount?
- Clean the barrel threads and the shoulder down to bare metal. Oil and old thread locker keep a mount from seating.
- Thread the mount on by hand to the shoulder. If it has a flat side or ports, shim it so it lands where it should when tight. Use shims, not a crush washer: a crush washer rarely crushes evenly and can tilt the mount off the bore.
- Take it back off, put a high temperature thread locker such as Rocksett on the threads, and torque it to the maker's spec against the shoulder or shims.
- Let it cure as the thread locker's directions say before you shoot it, then check that the can goes on and comes off cleanly.
- Check your zero with the can on. Most rifles move a little.
Why do QD mounts use a taper?
Threads hold a can on; they don't center it well. Every quick detach mount here has a cone just behind the lock that the can pulls down onto. The cone puts the can square to the bore every time it goes on, and it seals, so carbon stays out of the threads and the can comes off after a long string. Turn on the cutaway above to see it.
Direct thread cans skip the cone and seat on the barrel shoulder instead, which is why a clean, square shoulder matters more on them.
Frequently Asked Questions
Which SureFire muzzle devices are Fast-Attach?
The SF3P and SF4P flash hiders, the WarComp, and SureFire's Fast-Attach brakes and adapters. They're the mount: the can goes straight onto them.
Will a SureFire can go on a Dead Air or SilencerCo mount?
No. SureFire cans fit SureFire Fast-Attach devices only. None of the quick detach systems cross over.
Do SureFire flash hiders need a crush washer?
No. SureFire tells you not to reuse the crush washer, shims or spacers from the old device. Time it with SureFire's own shims, coat the threads with Rocksett, torque it to 20 to 30 ft-lbs and let it cure 24 hours.
What are the different suppressor mount types?
Five systems carry most rifle cans: SilencerCo ASR, Dead Air KeyMo, SureFire Fast-Attach and HUXWRX QD, which are quick detach, and HUB, a 1.375x24 thread on the back of the can that takes a swappable adapter. The sixth way is direct thread, where the can screws straight onto the barrel's muzzle threads.
Can I put any suppressor on any mount?
No. Each quick detach can only seats on its own maker's mount: a KeyMo can won't go on an ASR flash hider, and a SureFire can won't go on a KeyMo one. A HUB can is the way around it, because you swap the rear adapter to ASR, KeyMo or direct thread.
What is the best suppressor mount system?
There isn't one best mount, because the can decides it. Pick the can for its sound, weight and back pressure, then run its maker's mount on every rifle it will ride on. If you want to keep your options open, a HUB can lets you change systems later for the price of an adapter.
Should I use a crush washer or shims on a suppressor mount?
Shims. A crush washer rarely crushes evenly, so it can leave the mount a hair off the bore, and the can follows the mount. Every major can maker says to seat a mount against the barrel shoulder or a shim, with a high temperature thread locker such as Rocksett.
Do suppressor mounts have to match my barrel's thread pitch?
Yes, the mount threads onto the barrel, so buy it in the barrel's pitch: 1/2x28 on 5.56 and .22 LR, 5/8x24 on .308, .300 Blackout and 6.5 Creedmoor. The can side doesn't change, so one .30 can runs on both with the right mount on each rifle.
Does a QD mount hurt accuracy?
Not when it's installed right. The taper centers the can the same way every time, so most rifles return to the same point of impact with the can on. Expect that point to differ from the bare muzzle, and check your zero with the can on.
Do I need a flash hider to run a suppressor?
Only on a quick detach system, where the flash hider or brake is the mount. A direct thread can goes on the bare barrel threads and needs no device at all.
Cite this tool: GunPartPicker, “SureFire Fast-Attach Mount: How It Works and What Fits”, https://gunpartpicker.net/tools/suppressor-mounts/fast-attach. Data from the GunPartPicker catalog and real community builds, prices checked October 28, 2026. Free to cite with attribution.
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