No LW barrels on stock Gamo's. This rifle is a custom I've been working on occasionally for the last year. The LW barrel it's currently wearing is a 16mm blank that I machined to fit. It still needs some work, it's only running at 12 fpe with it's current tune, I have a couple of things I NEED to do, and several that I want to try, my goal is a smooth shooter producing somewhere around 16 fpe. Not sure I can get it, but I'm pretty sure I can get close. Later.