Fits mt ruger ar 556 ( 8500 model ) like a glove - UTG Pro AR15 Carbine Length Drop-in Quad Rail with Extension

Fits mt Ruger AR 556 ( 8500 model ) like a glove. It took some doing, but got it on. You just need to take your time on the install. I have that adjustable "ring" on my 8500 Ruger, so easier than standard ring that needs a special tool. The cover "caps" are a challenge to put on unused rail sections, but they do fit with some time taken to put them on. Super happy with the end result. I would recommend this for any Ruger AR 556 ( 8500 model ) owners who want to add cool stuff ( handle, lights, ect... ).