The CMMG PS90 Thread Adapter (brand part no. 57DA53A) lets PS90 owners mount a standard muzzle device on a factory PS90 barrel. It adapts the PS90’s proprietary M12 x 1.0 left-hand threads to the far more common 1/2-28 pattern, which fits most 5.56/.223 muzzle brakes, flash hiders, and thread protectors. That makes it a popular first step for a PS90 SBR build using a short barrel, where attaching the right muzzle device matters for both function and overall length. The adapter is finished in black to match the PS90’s factory furniture. It is a small part that solves a real compatibility problem for an otherwise hard-to-accessorize platform.

Key Specifications

• Converts the PS90’s M12 x 1.0 left-hand factory threads to the standard 1/2-28 pattern.
• Compatible with most 5.56/.223 muzzle devices, including brakes and flash hiders.
• Finished in black to match factory PS90 furniture.
• Weighs approximately 0.11 lb, adding negligible weight to the muzzle end.

Frequently Asked Questions

What does this adapter fit? It fits the PS90’s factory M12 x 1.0 left-hand threads and converts them to the standard 1/2-28 pattern.

What muzzle devices work with it? Most 1/2-28 threaded 5.56/.223 muzzle devices, including common brakes and flash hiders, will thread onto the adapter.

Buy the CMMG PS90 Thread Adapter

Order the CMMG PS90 Thread Adapter from our Lubbock, Texas gun shop and open up your PS90’s muzzle to the full range of standard gun accessories and parts. It is a simple bolt-on solution for a platform that otherwise limits your muzzle device options. Add it to your cart for fast, insured shipping direct to your door.