The SilencerCo Delta Adapter, 1/2×28 to 1/2×28 with O-ring engagement (SilencerCo part no. AC3) adapts a threaded .22 barrel to the 1/2×28 thread that rimfire suppressors use. The O-ring engagement keeps the muzzle threads clean and keeps the suppressor from loosening while you shoot. It is made for existing threaded barrels and works with any rimfire suppressor threaded 1/2×28, not only SilencerCo’s own. A thread protector comes with it for the times the suppressor is off the rifle.

Key Specifications

• The suppressor-side thread is 1/2×28, the common rimfire suppressor pitch.
• The adapter uses O-ring engagement, which keeps the muzzle threads clean and the suppressor from working loose.
• A thread protector is included, so the adapter’s threads are covered when no suppressor is mounted.
• It works with any rimfire suppressor threaded 1/2×28, regardless of brand.
• It is meant for existing threaded barrels, adapting the barrel’s own thread pitch to 1/2×28.
• The material is stainless steel, a durable choice for a part that stays on the barrel.

Frequently Asked Questions

Does it only work with SilencerCo suppressors? No. It works with any rimfire suppressor that is threaded 1/2×28, not only SilencerCo’s.

What does the O-ring do? O-ring engagement keeps the muzzle threads clean and keeps the suppressor from loosening while it is being fired.

Is a thread protector included? Yes. The adapter comes with a thread protector.

Buy the SilencerCo Delta Adapter 1/2×28 to 1/2×28 with O-Ring Engagement

A threaded .22 barrel only becomes suppressor-ready when the thread matches, and this adapter makes that match while adding the O-ring grip. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more suppressor parts and accessories while you are here.