This is a SilencerCo Adapter known as the Delta Adapter, model AC875.
Get your 22 suppressor-ready in a few seconds with a Delta Adapter. Available in multiple models" enjoy the benefits of o-ring engagement which keep the muzzle threads clean and prevent your suppressor from working loose under firing. Delta accessories are compatible with Switchback 22" Sparrow 22" Spectre 22" Warlock 22" and Osprey Micro 22.
Features:
Keeps muzzle threads clean
Compatible with multiple suppressors
