Glock 17 / 19 / 34 Gen 1–5 – 9mm Compensator – 1/2x28 – Blowhole
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
From Zaffiri Precision, the Blowhole compensator is a 9mm, 1/2x28 threaded-barrel comp built to reduce muzzle rise by redirecting gas upward—keeping the dot flatter and your follow-up shots faster. It’s machined from 17-4 stainless and designed to pair especially well with Zaffiri slides, but will work with compatible Glock-pattern 9mm builds that meet the fitment below.
Fitment
- Fits: Glock 9mm models Gen 1–5 (commonly used on G17 / G19 / G34)
- Thread pitch required: 1/2x28 (9mm threaded barrel)
- Best fit noted with: Zaffiri Precision slides
Does NOT fit
- Does not fit: G43 / G43X / G48
- Does not fit non-1/2x28 barrels
What it does
- Redirects gas to counter muzzle rise for faster, flatter shooting.
- Adds forward weight which can further help keep the nose down.
- Helps keep your sight picture stable—especially useful with a red dot.
Why it’s worth it
- Simple upgrade with real performance impact when the gun is tuned correctly.
- Durable 17-4 stainless construction.
- Includes thread locker + set screws so you’re not stuck mid-install.
Specs
- Caliber: 9mm
- Thread pitch: 1/2x28
- Material: 17-4 stainless steel
- Weight: 2.64 oz
- Finish: See variant (Black Nitride / Polished Stainless / TiN Gold)
What’s included
- Blowhole compensator (1)
- Vibra-tite® Red 131 thread locker
- Set screws
Tools needed
- Hex/Allen key for set screws
- Torque discipline (don’t “gorilla tighten” small hardware)
Install notes
- Unload and clear the firearm before installation.
- Compensators may require a different recoil spring weight depending on your ammo and setup.
- After install: function check, then test-fire for reliability before carry/defensive use.
Verify before you buy
- Your barrel is 9mm threaded 1/2x28.
- Your model is not a G43 / 43X / 48.
- You’re willing to tune the gun if needed (ammo + recoil spring weight).
⚠ Install & Compatibility Disclaimer: Compensators change slide dynamics and may require tuning (ammo selection and/or recoil spring assembly weight) to ensure reliable cycling. Improper installation or lack of function testing can affect safety and reliability. Buyer assumes all responsibility for safe installation, function testing, and lawful use.
⚠ Glock Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by Glock, Inc. or Glock Ges.m.b.H.
All references to GLOCK® are used solely to identify firearm models, parts compatibility, and fitment information for customers. Glock is a federally registered trademark of Glock, Inc. and Glock Ges.m.b.H.
Any product sold on this site referencing Glock is aftermarket, not OEM, and is not manufactured by Glock. Glock does not warranty, authorize, or guarantee the performance, safety, or reliability of any third-party components or modifications.
Firearm parts should be installed by a qualified armorer or gunsmith. Improper installation, modification, or use of aftermarket components may affect firearm safety, reliability, and void manufacturer warranties. By purchasing and installing third-party parts, the buyer assumes all responsibility for safe handling, installation, function testing, and use of their firearm and accessories.