Got this one for my WE SCAR since holding that well machined Picatinny rail is asking for your fingers to be sliced off, literally. Initially I thought these wouldn't hold on well and I may need to get another set, they were surprisingly sturdy, and also easy to cut if necessary. Goes really well with my AFG 2 I also got recently, holds very comfortable now even if it increases the SCAR's profile a good bit.