The standout feature of this carrier is its innovative 4-

Setting Adjustable Vent System. Specifically, designed to alleviate excess gas pressure generated by suppressor use, it extends the dwell time and minimizes blowback for a smoother shooting experience. The four different settings fine-tune the gas pressure according to specific needs and preferences.

Adjustments can be made without removing the carrier from the rifle for quick and easy customization on the Fly. These retail for over $200  I have 2 like new available