FAXON EXOS-543 PISTOL COMPENSATOR FOR GLOCK® GEN 4 - 9MM

What the EXOS-543 Does

A pistol compensator threads onto the muzzle and redirects propellant gas as it leaves the bore. Because the bore of a Glock® sits above your hand, recoil rotates the muzzle upward — muzzle flip. The EXOS-543 uses that same gas to push the muzzle back down, so the sights settle faster and follow-up shots come sooner. It does not reduce the cartridge’s total recoil energy; it changes the direction the muzzle moves.

EXOS® does this with a single expansion chamber and three ports angled at 45°. Straight-up ports only act on gas after it has left the bore axis; the angled EXOS ports catch it earlier and vector it up and forward, so more of the available energy goes into counteracting flip. A single chamber keeps the comp short and light, which matters on a carry or duty pistol where a long, heavy comp changes how the slide cycles.

The 543 shares its porting and internal design with the Gen 3 EXOS-513 and Gen 5 EXOS-553. What changes is the body: the rear of the comp is profiled to the Gen 4 slide nose so it mates cleanly and sits flush on a Faxon threaded barrel, and the bore and guide-rod relief are cut for Gen 4 barrel and recoil-assembly dimensions.

What’s Included

Tested Performance

Faxon measured the double-stack Glock® EXOS® in a Ransom rest on a Glock® 19, firing 115 gr 9mm and recording the muzzle’s peak upward rotation in degrees with a bare threaded barrel and with the comp installed. Leading aftermarket compensators were run on the same host under the same conditions.

Test host was a Gen 3 Glock® 19 with the EXOS-513; the EXOS-543 uses identical porting and chamber geometry with a Gen 4 body profile. Results vary with ammunition, recoil spring, and grip.

Installation

EXOS-543 FAQs

Which pistols does the EXOS-543 fit?

Glock® 17, 19, and 34 Gen 4 with a 1/2x28 threaded barrel. It was engineered and function-tested on all three. Gen 3 and FX-19 pistols use the EXOS-513; Gen 5 pistols use the EXOS-553; the 43, 43X, and 48 use the EXOS-523 and EXOS-533.

How much does it reduce muzzle flip?

In Faxon’s Ransom-rest testing on a Glock® 19 with 115 gr 9mm, the double-stack EXOS® reduced peak muzzle rise by 28% versus a bare threaded barrel, the lowest rise of every compensator in the test and the tightest shot-to-shot spread. The EXOS-543 uses the same porting; only the body profile is Gen 4-specific.

What is the difference between the EXOS-513, 543, and 553?

Porting, chamber, and internal design are identical. The body profile is different on each so the rear of the comp mates to that generation’s slide and sits flush. Match the model to your generation: 513 for Gen 3 and FX-19, 543 for Gen 4, 553 for Gen 5.

Will it sit flush with my slide?

On a Faxon Gen 4 threaded barrel, yes. On other 1/2x28 barrels, it sits flush when the muzzle protrudes 0.600″ or less past the slide; with more protrusion it still works but stands off from the slide.

Do I need a different recoil spring?

Usually not with standard-pressure or +P ammunition. A compensator bleeds off gas that would otherwise help drive the slide, so very light target loads can occasionally fail to lock the slide back on the last round. Step up to a standard 115–124 gr load first; a slightly lighter recoil spring is the next option for shooters who run light loads exclusively.

Will my holster still fit?

Installed, the EXOS-543 adds 1.125″ ahead of the slide. Open-bottom holsters generally work as-is; closed-toe holsters need to be cut for a compensator, and most holster makers offer a comp option for the Gen 4 17, 19, and 34.

Does it work with a red dot or suppressor-height sights?

Yes. The single-chamber body keeps a low profile above the bore, so it does not block standard-height sights or a slide-mounted optic. The ports vent upward, so expect some visible gas in the sight picture on bright days, which is normal for any top-ported comp.

Where is the EXOS-543 made?

Machined from 6061 aluminum and black anodized in the USA by Faxon Firearms, a family-owned, federally licensed manufacturer in Greater Cincinnati, Ohio. Covered by the Faxon Lifetime Guarantee.

Faxon Lifetime Guarantee. Covers manufacturing and material defects to the original purchaser. Excludes damage from misuse, neglect, non-standard ammunition, or modifications. Finish wear from normal use is not a defect. Register your product at faxonfirearms.com/product-registration to expedite service. Full terms: faxonfirearms.com/warranty-privacy-terms.

Glock® is a registered trademark of Glock, Inc. Faxon Firearms is not affiliated with or endorsed by Glock, Inc.; trademarks are used for compatibility reference only. EXOS® is a registered trademark of Faxon Firearms. Muzzle-rise figures are from Faxon internal Ransom-rest testing with 115 gr 9mm ammunition; results vary with ammunition, recoil spring, and host condition. Compensators can change a pistol’s operating characteristics; always confirm function with your chosen ammunition before carrying.

For questions, contact customerservice@faxonfirearms.com.