Hammer Arms makes a barrel extension for the G2. You can get one and have a custom barrel made for it. I don't think anyone is making prefits for the G2. There's a thread on G2 compatibility on the second page of this forum. I've got some issue with my G2 Recon. I'm in the process of trying to get it back to Remington for evaluation. If they don't fix it I'll be calling the guys at Hammer