The SilencerCo Delta Adapter (brand part number AC3) is a 1/2×28-to-1/2×28 O-ring engagement adapter built to get a .22-caliber host firearm suppressor-ready in seconds. SilencerCo’s O-ring engagement design keeps muzzle threads clean and helps prevent a suppressor from working loose during firing, addressing a common frustration with direct-thread mounting on rimfire hosts. This particular adapter shortens the usable thread engagement from 0.6 inch to 0.4 inch, adjusting fit for hosts with shorter available thread length. It’s compatible with SilencerCo’s Switchback 22, Sparrow 22, Spectre 22, Warlock 22, and Osprey Micro 22 suppressors, giving owners of those cans a quick way to adapt mounting on compatible hosts.

Key Specifications

• Uses an O-ring engagement design to keep muzzle threads clean.
• Helps prevent a suppressor from working loose under firing.
• Adapts 1/2×28 to 1/2×28 threading, shortening engagement from 0.6 inch to 0.4 inch.
• Sized for .22 LR hosts.
• Weighs approximately 0.05 lb, adding negligible weight to the muzzle.
• Compatible with the Switchback 22, Sparrow 22, Spectre 22, Warlock 22, and Osprey Micro 22.
• Classified as a silencer accessory, not a suppressor itself.
• Installs in seconds, with no gunsmithing required.

Frequently Asked Questions

What does the O-ring engagement do? It keeps muzzle threads clean and helps prevent the suppressor from working loose under firing.

Which SilencerCo suppressors is this adapter compatible with? The Switchback 22, Sparrow 22, Spectre 22, Warlock 22, and Osprey Micro 22.

How much does this adapter shorten thread engagement? From 0.6 inch down to 0.4 inch.

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

Get your .22 host suppressor-ready in seconds. Order it from our Silencer Co lineup, part of our Class 3 parts and accessories selection, at our Lubbock, Texas gun shop for fast, direct shipping.