I got this idea from an older post here on AGN. I thought I would show my completed project. I bought a short riser base for about $10 and a scope picatinny rail extension for about $20 on Amazon. I then attached them upside down to the short picatinny base on the FX impact m4 trigger guard. I was then able to place my bipod further forward to make a more stable platform. I would think this will also work on other Airgun's.