Which pistols need a booster and which take a fixed mount, the sub-4.5 oz cans their makers clear to thread straight onto most 9mm pistols, thread pitch, suppressor-height sights, holsters, subsonic ammo and the zero-tax eForm 4.
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Suppressing a pistol is one decision followed by a parts list. The decision is whether your barrel moves when the gun fires, because that sets the mount: a booster piston for a tilting barrel, a fixed mount for a barrel that stays put, or one of the new sub-4.5 oz cans that skip the booster entirely. Everything after that, thread pitch, sights, holster, ammunition and paperwork, follows from the host you already own.
A suppressed pistol needs four things: a barrel threaded in the right pitch, a suppressor rated for the cartridge, the mount that your host action demands, and an approved transfer. The first and last are straightforward. The mount is where setups go wrong, because the same 9mm can needs different hardware on a Glock than it does on a Ruger Mark IV, and a piston bought for the wrong pitch will not thread onto the barrel at all.
Two more parts make the result usable rather than merely functional. A standard pistol can sits directly in the line of the factory irons, so suppressor-height sights restore the sight picture, and a threaded barrel with a thread protector no longer fits a closed-bottom holster. Neither is optional if you intend to carry or train with the pistol as configured, and both are covered below. If you are still choosing the can itself, the best 9mm pistol suppressor guide ranks nineteen cans for tilting-barrel handgun hosts, split into boosterless ultralights and classic piston cans, with dedicated rankings for .45 ACP, 10mm and .22 LR hosts.
If the barrel moves when the pistol fires, it needs a booster or a can light enough that its maker waives one; if the barrel is fixed to the frame, it needs a fixed mount. That single rule sorts almost every host. Browning-pattern pistols (Glock, SIG P320 and P365, S&W M&P, HK VP9 and USP, FN 509, CZ 75, Walther PDP, 1911) tilt the barrel to unlock and need a piston under any can heavier than the boosterless class covered below. The Beretta PX4 and Grand Power rotate the barrel instead of tilting it, but the barrel still moves, so suppressor makers set them up with a piston too. The Beretta 92 is the odd one out: it drops a locking block and recoils the barrel straight back, SilencerCo catalogs a piston for it, and it often runs a light can with no booster at all. The pistols that skip the booster are the ones whose barrels never leave the frame: the gas-delayed HK P7 and Laugo Alien, straight-blowback centerfires like the Walther PPK, and nearly every .22 LR pistol.
| Pistol | Action | Mount |
|---|---|---|
| Glock 17, 19, 45, 43X, 48, 20, 21 | Tilting barrel (Browning short recoil) | Booster piston in the barrel's pitch |
| SIG P320, P365 | Tilting barrel | Booster piston |
| S&W M&P 2.0, HK VP9, HK USP, FN 509, CZ 75 and P-10, Walther PDP and PPQ, Beretta APX | Tilting barrel | Booster piston |
| 1911 (.45 ACP) | Tilting barrel (swinging link) | Booster piston, .578x28 |
| Beretta 92 and M9 | Recoil-operated, falling locking block; barrel moves straight back without tilting | Piston per SilencerCo's fit guide (1/2x28XL, AC59), though a light can often runs direct-thread |
| Beretta PX4, Grand Power | Rotating barrel, recoil-operated | Booster piston (CAT confirms its booster runs on rotating barrels) |
| HK P7 | Fixed barrel, gas-delayed blowback | Fixed mount or fixed-barrel spacer |
| Laugo Alien | Fixed barrel, gas-delayed blowback | Fixed mount or fixed-barrel spacer |
| Walther PPK, P22 | Fixed barrel, straight blowback | Fixed mount or fixed-barrel spacer |
| SIG P322, S&W M&P 22 Compact, Ruger Mark IV, Browning Buck Mark, Taurus TX22, S&W SW22 Victory | Rimfire blowback, fixed barrel | Fixed mount or fixed-barrel spacer on a rimfire-rated can |
| Glock 44 | Rimfire blowback, non-tilting floating barrel | Direct-thread rimfire-rated can, no booster |
| B&T TP9 | Proprietary TP9/MP9 quick-detach muzzle | B&T's dedicated QD suppressor for that interface |
Two hosts deserve a note. The Glock 44 is a blowback .22 whose barrel does not tilt, so it needs no booster despite looking like a G19; run a rimfire-rated can on it direct-thread, not a 9mm can. The B&T TP9 has no ordinary muzzle thread at all: it uses B&T's proprietary TP9/MP9 quick-detach interface, which is not the HK-pattern 3-lug found on the APC9 or MP5, so the answer there is B&T's own dedicated can rather than a piston or a spacer.
Dedicated 9mm titanium RBS suppressor with B&T's proprietary TP9/MP9 quick-detach mount.
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A booster lets a tilting-barrel pistol cycle with a suppressor by keeping the can's mass off the barrel during the unlock stroke. A Browning-action pistol fires with the barrel and slide locked together; both recoil a short distance, then the barrel cams down and stops while the slide keeps going to eject and feed. A pistol is tuned so that recoil energy, slide and barrel mass and the recoil spring all balance across that sequence. Hang eight or ten ounces of suppressor off the muzzle and the barrel now has to accelerate that mass rearward before it can unlock, which is exactly the energy the can is also bleeding off. The slide comes back short, the case does not clear, and the gun stovepipes or fails to feed.
The Nielsen device solves it with a piston, a spring and a housing. The piston threads onto the barrel. The housing is part of the suppressor and carries a spring that bears against the piston. On firing, the barrel and piston move rearward while the suppressor's own inertia holds it nearly stationary, so the piston slides rearward out of the housing against the spring instead of dragging the can along. That decoupling is the first half of the job. The second half is why it is called a booster: powder gas trapped in the housing behind the piston face pushes rearward on the barrel and adds impulse to the unlock. Once the action has cycled, the spring shoves the can back into position for the next shot. The piston and the housing are two separate parts, and the piston is what you buy in your barrel's pitch.
Pistons are mount-specific as well as pitch-specific. The external thread that mates to the housing varies by manufacturer and even by model: Dead Air says its Odessa-9 accepts legacy SilencerCo, Rugged and Griffin pistons, while its Ghost and Wolfman take Dead Air pistons only. Check the maker's chart rather than assuming a piston crosses over. The three below cover the two pitches that account for nearly every 9mm pistol, and the suppressor mounting systems guide compares the HUB, Alpha and 3-lug interfaces on the back of the can.
The default 1/2x28 9mm piston for SilencerCo pistol mounts
1/2x28 piston for the Obsidian 9
European M13.5x1 LH barrels on a Dead Air P-Series mount
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Two full-size cans show the booster path done well. The Osprey's eccentric bore puts its body below the sight line so factory irons keep working, and the Obsidian 9 takes either the Rugged piston or the Rugged fixed spacer, so one can moves between a Glock and a PCC.
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A fixed-barrel host gets a rigid mount, never a working booster. The HK P7, Laugo Alien, PPK, nearly every .22 LR pistol and every PCC hold the barrel stationary, so there is no unlock stroke for a spring to protect and nothing for it to do but flex. Rugged's manual directs a fixed mount on every fixed-barrel firearm, and a spring cycling on a barrel that never moves can shift point of impact and wear the piston for no benefit. Most pistol cans handle this with a fixed-barrel spacer that replaces the spring inside the same housing; cans with an Alpha or HUB rear take a direct-thread mount instead.
Locking a SilencerCo pistol can to a fixed-barrel host
Fixed-barrel conversion for a P-Series mount
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A new class of ultralight 9mm cans, most of them titanium and one a modular aluminum stack, weighs so little that the barrel can carry them through the unlock stroke unassisted, and their makers say so in writing. Suppressor mass is the dominant variable, and below roughly 4 to 4.5 oz the makers stop requiring a booster on most hosts: JK Armament puts the line at about 4.5 oz and ECCO calls 4 to 5 oz the approximate limit on most locked-breech handguns. It is a rule of thumb, not a threshold. ECCO notes that hammer-fired hosts tolerate added mass better than striker-fired ones and that some pistols will still need its booster even with a 4 oz can; Stealth Additive adds that where the mass sits matters as much as how much there is; and ECCO warns that a slide-mounted red dot can push total reciprocating mass past what a rigid mount will run. SilencerCo's 3.9 oz Spectre 9 still ships with a piston housing. The first five cans in this section run from 1.2 to 4.3 oz and thread directly onto the barrel with no piston, no spring and no moving parts in the mount, so the only new variable in the recoil cycle is the can's own mass. The sixth, Q's 8 oz aluminum ERECT9R, ships with a piston and drops it only on hosts Q says can carry it.
The permission is per model and comes with conditions, and that is the part to read before buying. BANISH says minor changes to springs, weights or ammunition may be needed to keep factory-like function. Stealth Additive calls the Glock 17 and 34 the most cycling-sensitive hosts, even with a booster, and says spring weight may need to come down. ECCO lists the SIG P320, the S&W Shield EZ .380 and the M&P Shield 9 as hosts that struggle with its TLX rigid-mounted, and does not recommend any of its cans for SIG handguns. Q says only that some tilt-barrel pistols do not need the booster, and ships one in the box for the ones that do. The trade for that simplicity is internal volume: a 2.5 oz can holds a fraction of the gas a full-size can does, so expect less suppression than a full-size can on a piston, and none of these makers publish independent sound data to say how much less. SilencerCo, Dead Air and Rugged all require their piston on a tilting barrel, and none of them limits that rule to heavy cans; weight alone is never the test, the manufacturer statement is.
Lightest boosterless can, and the one built to fit a holster
The most explicit no-booster statement, with a multi-caliber and full-auto rating
Shortest fixed-length boosterless can, 3.7 inches of Grade 5 ELI titanium
Tubeless 4-inch titanium can rated from .380 through .357 Magnum, 2.8 oz with the mount on
Full-length boosterless can that also covers .357 Magnum and 7.62x39
Modular can that ships with a booster and drops it only on hosts that allow it
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Boosterless can launches, piston and fixed-mount fitment updates, and eForm 4 wait-time changes as they happen.
Domestic 9mm barrels are 1/2x28, European 9mm barrels are usually M13.5x1 LH, most .45 ACP barrels are .578x28 and most aftermarket .40 S&W barrels are 9/16x24, while factory-threaded Glock and most HK .45 and .40 barrels run 16x1 LH and 14.5x1 LH, with the HK Mk 23 alone on 16x1 RH. Pistons, spacers and direct-thread mounts are all sold by pitch and none of them interchange, so a 1/2x28 piston will not start on a left-hand metric barrel no matter how it is coaxed. Confirm the pitch stamped or specified for your barrel before ordering the mount; the muzzle thread checker lists the standard pitch for every common host and the pistons and cans that match it.
If the pistol came with a plain barrel, a drop-in threaded barrel is the whole conversion; no slide work, no fitting on most Glock-pattern hosts. The two below are 1/2x28 drop-ins for the most common Glock hosts, and the best Glock barrels guide covers the rest of the lineup. Whatever barrel you choose, check concentricity before the first suppressed shot: a threaded muzzle that is even slightly off-axis walks the bullet into a baffle, and the suppressor alignment rod guide explains which rod fits which bore and how to read it.
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A mounted pistol can sits in the line of the factory irons, so suppressor-height sights are needed to see over it. The taller front and rear lift the sight plane above the tube, and on an optic-cut slide they also co-witness through the dot as a backup. The one exception is an eccentric-bore can like the Osprey, whose offset body sits below the sight line and leaves factory irons usable. The three sets below are Glock-pattern picks from budget steel to a tritium-plus-fiber front; the best suppressor-height sights guide covers SIG, HK, FN, M&P and Hellcat slides and the co-witness math.
Budget suppressor-height co-witness set for Glock
Tritium suppressor-height set for the slimline 43X and 48
Fiber-optic plus tritium suppressor-height set for Glock
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The threaded muzzle and its thread protector extend past the end of a standard holster body, and the taller front sight drags on a standard sight channel. An open-bottom holster with a raised sight channel fixes both, and it is the same holster you want for a compensated barrel. The rig below is built for exactly that combination. Carrying with the can attached is a different problem; JK says its 105 CCX fits many standard holsters in its short configuration, and none of the other makers here make a holster claim at all.
AIWB holster that clears a threaded barrel and tall sights
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Run subsonic ammunition or the can only removes the muzzle blast and leaves the supersonic crack. The line sits near 1,125 fps at sea level, and it is drawn per load, not per bullet weight. In 9mm the 147-grain duty loads are the reliable subsonics: Federal catalogs its 147-grain HST at 1,000 fps from a 4-inch barrel against 1,150 fps for the 124-grain HST, and the Speer and Winchester 147s below are listed at 985 and 990 fps. Most 115 and 124-grain loads run well over the line from a service-length barrel, though a few light-bullet range loads are catalogued close to it, so read the box velocity rather than trusting the weight. .45 ACP is the easy case, because the standard 230-grain load leaves the muzzle around 850 fps; the lighter 185-grain and +P defensive loads run faster, so check their published velocity too. The three 147-grain loads below are duty hollow points rather than range fodder, which is the right choice for a suppressed pistol kept for home defense.
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Expect more gas at the shooter. A suppressor holds the powder gas that would have left the muzzle, and some of it finds its way back through the action and out the ejection port as a sooty puff on every shot. Glocks have a reputation for running dirtier suppressed than most, and a suppressed pistol needs cleaning more often than the same gun ran bare. Follow the can maker's interval for the baffles, keep a film of high-temperature grease on the piston threads so carbon does not lock the mount to the barrel, and pull the can between sessions rather than leaving it torqued on for a month.
Suppressing a pistol is worth it for a home-defense gun and for any pistol you shoot often, and the two reasons people used to skip it, the two-hundred-dollar tax stamp and the months-long wait, are gone. The federal transfer tax on suppressors has been zero since January 1, 2026, and individual eForm 4 approvals now clear in days; the suppressor wait time tracker carries the current figures by filing type. The how to buy a suppressor guide walks the eForm 4, fingerprints, photo and NICS check end to end. Suppressors are legal to own in 42 states.
One change to know about: in Silencer Shop Foundation v. ATF a federal court held on August 5, 2026 that the NFA's registration and transfer-approval requirements are unconstitutional as applied to suppressors and the other categories the 2026 tax cut zeroed out, and the injunction took effect August 13. The remedy is party-specific rather than nationwide, and the NFA stays in force for everyone outside it. Members of Gun Owners of America and the five other plaintiff organizations, and customers of Palmetto State Armory, B&T USA, SilencerCo Weapons Research and Hot Shots Custom, can take a can on a standard 4473 and NICS check through participating dealers in states whose own law does not tie possession to federal registration; everyone else still files the eForm 4. Our breakdown of who the ruling actually covers draws the line.
What you give up is real but modest: a front end 1.05 to 1.4 inches across on the cans here and, on a full-size can, four to eight inches longer; gas at the face; taller sights; a new holster; and a can that needs cleaning. The boosterless cans above shrink most of that list, which is why they exist.
Still deciding between the boosterless cans? Sort by weight, length or price. The first five thread straight onto the barrel, in 1/2x28 as listed here and, for the BANISH and ECCO cans, in a separate M13.5x1 LH version; the ERECT9R runs its included 1/2x28 piston unless the host can carry it bare. The differences are ounces, inches and which hosts the maker stands behind.
| Product | Mount / Rear | Buy | |||
|---|---|---|---|---|---|
| JK Armament 105 CCX 9mm | 2.5 oz | 1.9 to 4.6 inches; 1.55 to 4.25 inches without mount | 1/2x28 JK 105 LT thread mount included | $422.99 | Buy |
| Stealth Additive Works SHIV 9mm | 2.5 oz | 3.7 inches | Direct thread 1/2x28 | $559 | Buy |
| BANISH TAC 9K TI | 2.7 oz | 4.1 inches | Dedicated 1/2x28 or M13.5x1 LH direct thread | $699 | Buy |
| ECCO Machine Canine II 9 | 2.8 oz | 4 inches without mount; 4.3 inches with mount | Alpha 1.125x28; ultralight 1/2x28 or M13.5x1 LH direct-thread mount included | $479 | Buy |
| ECCO Machine TLX 9 | 4.3 oz | 5.5 or 6.5 inches without mount; 5.8 or 6.8 inches with mount | Alpha 1.125x28; ultralight direct-thread mount included | $549 | Buy |
| Q Erector 9 | 8 oz | 8.7 inches (10 baffles) / under 4 inches (1 baffle) | 1/2x28 booster included (SKU SIL-E-9); other Q mounts available | $799 | Buy |
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Six steps, and only the first one branches. The host action decides piston, spacer or boosterless can; the pitch decides which one; the rest makes the finished pistol shootable and carryable.
| Step | Action | What to Confirm |
|---|---|---|
| 1 | Classify the host action | Moving barrel (Glock, P320, 1911, PX4) takes a piston; the 92 often runs light cans direct-thread; fixed barrel (P7, Alien, .22s) takes a fixed mount |
| 2 | Thread the barrel, confirm the pitch | 1/2x28 domestic 9mm, M13.5x1 LH European 9mm, .578x28 most .45 ACP, 9/16x24 most .40 S&W; most factory HK/Glock .45 and .40 are 16x1 LH and 14.5x1 LH (HK Mk 23: 16x1 RH) |
| 3 | Pick the can and its mount | Piston or spacer matched to the specific can's housing, or a boosterless can whose maker names your host |
| 4 | Complete the transfer | eForm 4 at zero federal tax, NICS, fingerprints and photo; individual approvals run in days |
| 5 | Mount and check alignment | Grease the piston threads, torque the mount, verify bore alignment with a rod before the first shot |
| 6 | Sights, holster, ammunition | Suppressor-height sights, open-bottom holster with a tall sight channel, a load with a published subsonic velocity (147-grain 9mm duty loads, 230-grain .45) |
You are responsible for complying with all federal, state, and local laws governing suppressor ownership and use, including NFA registration, transfer requirements, and state-level restrictions. This guide is informational only and is not legal advice; consult an attorney for jurisdiction-specific questions.
Avid shooter with 10+ years of experience including competition shooting, an associate member of the Professional Outdoor Media Association (POMA), and a member of the National Shooting Sports Foundation (NSSF) and Safari Club International (SCI). Built 10+ AR-pattern rifles and several handgun platforms for home defense, competition, and suppressed night shooting.
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