Trijicon Sup Ns Set Grn Glk 42 Yf mr ON SALE WOMENS CLOTHING ON SALE has active noise cancellation has active noise cancellation Underside clearance slot to allow mounting of m lok accessories to acc chassis forend even with weights installedside clearance slots to allow mounting of m lok accessories to acc chassis forend even with weights installed3 sets of mounting holes to allow the weight to be shifted inside the barrel channel at 20mm () increments for tuning the rifles balance point With unique versatility for the ever evolving pistol landscape trijicon suppressor optic height sights feature a unique shock resistant design