Perfect fit for pic rail style gas block carbine length. - MFT Tekko Polymer AR15 Carbine 7" Drop In Rail System

I love it, fits great I don't know why so many people are having an issue with it yeah it's hard to get on but it's because of the Delta ring if you have the proper tools to pull it back you won't have an issue. If you have a sling mount attached to your gas block you're going to have to take that off. I think that's where most people are running into the issue but you can clearly see that in the pictures. If you take it to a gunsmith or somebody who knows what they're doing they're going to get it on for you without issues.