Specifications and Features:
Fit flush with the end of the barrel but are longer than competitors' tubes
Proprietary differential banded gas seal eliminates residue build up and makes chokes easy to remove and install
Integrated spring suspension holds the seal tight, yet allows expansion against the barrel wall for a perfect fit and a smooth transition for the shot column entering the choke
Gas is controlled at the interface between choke and where it seats in the bore
From skeet to full choke, patterns tighten consistently and reliably

Fits Invector DS specific models only. Not interchangeable with normal Invector/Invector Plus systems.