Worked fine for my need - Midwest Industries AR Rail Forearm Mount

Didnt quite fit my Rock River mid-length handguard, hole spacing was off. I installed it with one nut facing down to lock into the hole and the other facing up since it did not align with the next hole. Trimmed my heat shield just a bit for best fit. This mounts a bipod or light just great and is small enough to not be in the way.