What number pilot are you using I need to get one myself I'm using the GT brass right from Gap I believe it might be Hornady because I don't see the alpha mark on it
I also have the Gen 1
I have a ACIS mk13 model 5 thumbhole chassis if that's what you're looking for
562 254 1604. You can call or text me I'll be back in town Monday evening upon a moose hunt in Alaska right now