This is a Nordic Components Mount known as the QD, model TRL-MLOK-QD.
Nordic Component M-LOK accessories are designed for use with all M-LOK compatible handguards. All M-LOK components are machined from 6061 aluminum and include all necessary hardware for mounting directly into the M-LOK slot.
Features:
The QD mount accepts standard push-button QD sling swivels and is of a non-rotating design with eight detent slots (four positions).
