Here's a custom grip I made from InstaMorph moldable plastic.I've never been satisfied with my grip on my Benjamin Marauder gen 1. My trigger position and hold left my fingers dangling off the stock. I found this product on Amazon. Basically it is a moldable plastic that comes in bead/pellet form. You heat it up in water to 150º and it sticks together. You kneed and mash it together to mold it to your liking. The consistency is similar to silly putty. Once you get it to the shape you like you let it cool and harden, then you can cut, drill, shave and sand it to finish. I have attached it to my stock with double sided gorilla tape.