Worked great on a solid free float tube - UTG Pro Rail for Super Slim Drop-in Handguard

I used three of the on a free float tube on my 6.5 Grendel. I did not want to add picatinnyrails the rifle so I searched for some short rails that matched the 2.5 inch radius if my existing tube. These mate up perfectly. I measured, drilled and tapped for three of these (red light for coyotes, bipod and QD sling attachment. The only issue I had was that the screws were to short. I ordered screws 1/8" longer for the propper length. It couldn't have turned out better.