GEM 3-Lug Mount GM 45 Lunar Suppressor Adapter

The Gemtech 3-Lug Mount GM 45 is a suppressor adapter that threads into the rear of LUNAR-45, GM-45, and legacy TRINITY suppressors, opening up compatibility with HK MP5 barrels featuring the 3-lug mounting system. If you're running an MP5 or other rifles with 3-lug-threaded barrels—or have a barrel modified with Gemtech's male 9mm 3-lug adapters—this mount lets you attach your existing Gemtech suppressor without investing in a completely new can. It's a straightforward solution for shooters who already own Gemtech suppressors and want to expand their platform compatibility.

The adapter threads directly into your suppressor's rear cap, making installation quick and tool-free. Gemtech engineered this mount to maintain the mechanical and acoustic performance of your suppressor while giving you the flexibility to move it between 3-lug-equipped hosts. Whether you're a dedicated MP5 shooter looking to suppress a new upper or someone consolidating your suppressor collection across multiple firearms, this adapter keeps your investment working harder.

Keep in mind that this mount is designed specifically for Gemtech's 9mm suppressor line; compatibility with other brands' cans requires their approval. If you're unsure whether your suppressor or barrel combination works with this adapter, we recommend verifying thread pattern and 3-lug dimensions before purchase.

Key Features

• Direct-thread rear cap design for LUNAR-45, GM-45, and TRINITY suppressors
• Enables suppressor use on HK MP5 and 3-lug-adapted barrels
• Simplifies multi-platform suppressor ownership
• Tool-free installation and removal

Frequently Asked Questions

Will this adapter work with my suppressor?

The GEM 3-Lug Mount GM 45 threads into the rear of LUNAR-45, GM-45, and older TRINITY suppressors from Gemtech. If you own a different brand of suppressor, this adapter will not be compatible. Verify your suppressor model before ordering.

What barrels and firearms can I use this on?

This adapter is designed for HK MP5 barrels with 3-lug threading, as well as other rifle barrels that have been modified with Gemtech's male 9mm 3-lug adapters. Check your barrel's threading and adapter compatibility to ensure proper fit.

Do I need any tools to install it?

No. The adapter threads directly into your suppressor's rear cap and can be installed and removed by hand without special tools.