The SilencerCo Delta Adapter for the FN Five-seveN (SilencerCo part no. AC77) adapts the pistol’s M10x1 barrel thread to the 1/2×28 thread used by the Delta suppressor line. SilencerCo builds Delta adapters with O-ring engagement, which keeps the muzzle threads clean and keeps the suppressor from working loose under firing. This is the Five-seveN adapter in a range that also covers other pistols. It is the one to choose when your threaded barrel is the FN.

Key Specifications

• The pistol-side thread is M10x1, the FN Five-seveN barrel thread.
• The suppressor-side thread is 1/2×28, the thread the Delta line uses.
• The adapter is made for the FN Five-seveN, so it does not suit other pistols.
• It uses O-ring engagement, which keeps the muzzle threads clean.
• The same O-ring engagement prevents the suppressor from working loose under firing.
• Delta accessories are listed for the Switchback 22, Sparrow 22 and Spectre 22.
• Delta accessories are also listed for the Warlock 22 and Osprey Micro 22.
• SilencerCo says a Delta Adapter gets a .22 suppressor-ready in a few seconds.
• The Delta line also includes adapters for the Walther P22 (M8x.75) and GSG 1911-22LR (M9x.25).
• Other Delta adapters cover 1/2×20 to 1/2×28 and a 1/2×28 to 1/2×28 O-ring engagement adapter.

Frequently Asked Questions

What thread does the Five-seveN barrel use? SilencerCo lists this adapter as taking the FN Five-seveN M10x1 barrel thread to 1/2×28.

Which suppressors are listed for Delta accessories? SilencerCo states Delta accessories are compatible with the Switchback 22, Sparrow 22, Spectre 22, Warlock 22 and Osprey Micro 22.

Buy the SilencerCo Delta Adapter for FN Five-seveN Pistols, M10x1 to 1/2×28

Pistol barrels use a mix of metric and inch threads, which is why SilencerCo makes Delta adapters for each model. Order this one with our suppressor parts and accessories from our Lubbock, Texas gun shop for fast, insured shipping.