SILENCERCO DELTA ADAPTER FNH 1/2X28

Description

The SilencerCo Delta Adapter for the FN Five-seveN gives owners of that pistol a straightforward path to running a suppressor without permanent modification to the host. The Five-seveN ships from the factory with a proprietary muzzle arrangement, so suppressor mounting requires an adapter that bridges that geometry to a standard thread pattern. That is exactly what this piece does: it converts the barrel’s existing threading to 1/2×28, the most common thread pitch for centerfire and rimfire suppressors in this bore size, meaning you are not locked into a single suppressor or manufacturer.

The Delta family of adapters is designed around an O-ring engagement system. The O-ring serves a practical purpose beyond sealing — it keeps the muzzle threads clear of carbon and debris when the suppressor is off the gun, and it helps maintain consistent suppressor alignment and seating each time it goes back on. That consistent return-to-position matters for point-of-impact shift: a suppressor that seats the same way every time behaves more predictably downrange.

Because this adapter is chambered for use with 5.7x28mm, it accommodates the relatively small bore diameter of the Five-seveN without requiring an adapter stack or reducing bushings. Part number AC77 is specific to the FN Five-seveN platform, so fitment is direct rather than a generic solution that may require additional fitting. If you already own a 1/2×28-threaded suppressor, this adapter puts it to work on a host it otherwise could not mount to.

Shipping and availability: This item must ship to a licensed FFL dealer for transfer.