The screws that tighten the handguard 1 wasn't even threaded and the other one stripped out. Tried to contact them and they took days to respond. Steel is poor quality. I am worried about the quality of the barell nut now.
The picatinny rail itself is of good enough and suitable or serviceable quality. The mounting hardware is not well suited to a specific application and requires special fitting efforts to make the whole system work. Specifically the mounting screws are of a generic length that must be trimmed to seat correctly. Also the **** blocks that apply the fastener force are too thick to correctly seat beneath the vent rib. These components must be treated as a "project" and special fitting is required.
As a whole the hand guard is great, functions correctly and fit is really good.
There is some inconsistencies on the machining, nothing really to keep me from buying another one.