Gemtech 9mm Male 3-Lug Adapter – 1/2x28 Thread
Not Yet Rated | Write the First Review SKU: 222-GEM-12182
UPC: 609729000000
MFG#: 12182

Gemtech 9mm Male 3-Lug Adapter – 1/2x28 Thread | HK-Style Suppressor Mount

Quick. Reliable. Built to last.
This 9mm male 3-lug adapter with a 1/2x28 thread pitch is your precision-engineered bridge between a threaded barrel and a suppressor-ready 3-lug mount. Designed to meet the needs of 9mm shooters who demand both speed and durability, this adapter delivers consistent performance in any setup.

Product Overview

Whether you're running a 9mm PCC, subgun, or AR-9 with a 1/2x28 threaded barrel, this HK-style 3-lug adapter ensures fast suppressor attachment without sacrificing thread integrity. Its robust steel construction and black nitride finish offer lasting resistance to heat, corrosion, and wear — perfect for high-volume shooting.

This isn’t just an adapter. It’s the tactical upgrade your 9mm platform needs.

Features

• Thread Pitch: 1/2x28 TPI — standard for many 9mm platforms

• 3-Lug Male Interface: HK-style mount compatible with most 9mm suppressors

• Durable Material: Precision-machined from heat-treated steel

• Finish: Black nitride for corrosion resistance and smooth mounting

• Reliable Lock-Up: Designed for tight fit with minimal wobble

• Tool-Free Operation: Allows quick suppressor attachment/detachment without tools

• Thread Protection: Preserves barrel threads during repeated suppressor use

Why Choose This Adapter?

Suppressor users need a strong and consistent mount — not one that wears down threads or wobbles mid-session. This 3-lug adapter was built with exacting tolerances, ensuring precise fitment and repeatable alignment every time you mount up.

For tactical operators, recreational shooters, or competitive users, this adapter ensures your gear performs when it matters most.

Compatibility

• Works with 9mm suppressors that accept male HK-style 3-lug interfaces

• Fits 9mm barrels threaded in 1/2x28 TPI, including many AR-9 and MP5-style setups

• Compatible with most quick-detach 3-lug mounts — check your suppressor specs for confirmation

Specifications

Installation Tips

• Hand-tighten for temporary use or apply a small amount of thread locker for a more secure, semi-permanent install

• Always ensure your barrel threads are clean and undamaged before mounting

• Rotate the suppressor to engage the 3-lug system — it should lock with a firm snap

FAQs

Q: Will this adapter fit a 1/2x36 barrel?
No. This adapter is specifically designed for 1/2x28 threads, which are standard on many 9mm AR builds. For 1/2x36 barrels, a different adapter is required.

Q: Is it compatible with Gemtech and SilencerCo suppressors?
Yes — as long as your suppressor uses a female 3-lug HK-style mount, this adapter will work.

Q: Can I use it on a full-auto subgun?
Absolutely. The hardened steel and precise construction make it suitable for both semi-auto and full-auto use.

Q: What’s the difference between 1/2x28 and 1/2x36?
Both are thread pitches for 9mm barrels. 1/2x28 is typically used on AR-style builds, while 1/2x36 is more common on some pistol-caliber carbines. Thread compatibility is critical — match the adapter to your barrel.

Q: How should I maintain this adapter?
Clean it with a cloth and solvent after use, especially if running suppressed. Avoid harsh abrasives that can damage the nitride finish.

Upgrade Your Suppressor Setup Today

Get faster mounting, secure alignment, and maximum reliability — all in one high-performance 3-lug adapter. Whether you're building out a custom AR-9 or adding versatility to an MP5 clone, this is the piece that brings it all together.