The Yankee Hill Machine sRx QD Adapter (brand part no. YHM-4400) is the mounting interface at the heart of YHM’s sRx suppressor system, built for 9mm hosts with a 3/8-24 tpi thread. Machined from 17-4 stainless steel, it attaches to the industry-standard 1-3/8×24 HUB thread and features an internal taper seal in front of the threads that locks a suppressor on and forms a tight seal to keep gas and debris off the threads. The sRx Adapter must be paired with one of YHM’s sRx muzzle devices — the 4405, 4405-MB, or 4401-MB — to complete the system. It adds minimal length and weight to the setup, needs no shimming or timing to the barrel, and can be permanently attached to the firearm when needed.

Key Specifications

• Built for 9mm hosts.
• Cut to a 3/8-24 tpi thread pattern.
• Machined from 17-4 stainless steel for durability.
• Adds only minimal length and weight to the overall suppressor setup.
• Attaches to the industry-standard 1-3/8×24 HUB thread.
• Internal taper seal locks the suppressor on and blocks gas and debris buildup on the threads.
• No shimming or timing to the barrel required for installation.
• Must be paired with a YHM sRx muzzle device (4405, 4405-MB, or 4401-MB) to complete the system.
• Can be permanently attached to the firearm’s barrel when needed.

Frequently Asked Questions

Does this adapter come with a muzzle device? No, it must be paired with a separate YHM sRx muzzle device — the 4405, 4405-MB, or 4401-MB.

Do I need to shim or time this to the barrel? No, the sRx system is designed to install without shimming or timing.

What material is this adapter made from? 17-4 stainless steel.

Buy the Yankee Hill Machine sRx QD Adapter

Build the foundation of a sleek, low-profile sRx suppressor setup. Order the Yankee Hill Machine sRx Adapter from our Class 3 parts and accessories at our Lubbock, Texas gun shop for fast, direct shipping.