A310 Barrel Shroud Muzzle (6") for Airsoft Grenade Launcher - Complements 870 Shotgun Shell in Grenade Launchers - Airsoft3DThis A310 Barrel Shroud works with the Airsoft3D Inner Barrel Insert, Airsoft3D Aliens M40 HEDP Grenade Shell, and APS 870 Shotshell to provide a more precise barrel for the Grenade Launcher. This A310 Barrel Shroud has been tested to be compatible with the following products: Required: Airsoft3D Aliens M40 HEDP Grenade Shell (130mm) for APS 870 Shotshell Airsoft3D Inner Barrel Insert for ICS MGL Airsoft Grenade Launcher APS 870 CO2 Airsoft Shotshell