There are different inlets in the GRS. In the Berserk the # for AICS metal is 104015. PTG metal drops right in for AICS. If it's cut for BDL then there is 1 company that I'm aware of that make an AICS bottom metal that fits the BDL. Jard makes 1. I think I've got 1 in my stuff that I didn't use if you're interested. I've gone with the AICS cut on my Berserks.