I installed the 15" solo lite on my Maten and loved it. Super easy to install, is the perfect height on the top rail and lines up straight as an arrow with almost zero gap. Torque the set screws down and it wont go anywhere. I like his stuff so much I changed to the 14" Solo series with the integrated rail on it for my LRA bi-pod same deal perfect fit. I also use his adjustable gas blocks all top notch stuff no worries there. And he ships very fast if its in stock. You will need a 1 3/8 crows foot to torque the nut properly.