Barrel nut issue - TRYBE Defense AR-15 Extra Lightweight M-LOK Handguard w/ Cut Away Rail

Liked the look, weight and feel of this handguard and was taking a chance on a start up manufacturer. Upon trying to install, the barrel nut would not thread past one turn without binding. I tried other nuts from other manufacturers without incident. Looking at the threads on the nut, the peaks seem to be flat and therefore don't engage properly with the valleys on the upper. Returned to OP.