This is a Gemtech Flash Hider known as the QUICKMOUNT chambered in 762NATO, model 12153.
The NEW GEMTECH flash hiders are the culmination of user feedback" extensive testing" and decades of experience. The new flash hiders are more aggressive than ever to cut down on carbon build-up in your suppressor and to prevent it from getting stuck. Fits TPR-S" HVT-QM" QUICKSAND" and ONE suppressors.
Features:
Precision mounting shim kit
Built in carbon cutting grooves
Quick mount lugs for use with all Gemtech 7.62MM suppressors