SilencerCo AC77 Delta Adapter 1/2x28 FN Five-seveN Steel Black

The SilencerCo AC77 Delta Adapter is a precision-machined thread adapter purpose-built for the FN Five-seveN pistol. It converts the factory M10x1 barrel thread pattern to the standard 1/2x28 pitch so the host firearm can mount any SilencerCo rimfire suppressor (or other 1/2x28-threaded silencer/accessory).

Constructed from durable steel with a low-reflectance black finish, the AC77 uses an O-ring engagement system for a concentric, repeatable lock-up that holds alignment shot after shot. Designed around the 5.7x28mm FN Five-seveN platform, the adapter is fully compatible with SilencerCo's rimfire suppressor lineup, including the Switchback 22, Sparrow 22, Spectre 22, Warlock 22, and Osprey Micro 22.

Compact and lightweight, the AC77 adds minimal bulk to the host pistol while opening up suppressor mounting options on a platform that is not natively threaded for common 1/2x28 accessories.