Dead Air DA209B Front Cap R-Series 30 Cal 17-4 Stainless Steel Nitride Gray
https://www.tandktactical.com/shop/810128162494-dead-air-da209b-front-cap-r-series-30-cal-17-4-stainless-steel-nitride-gray-46283
https://www.tandktactical.com/web/image/product.template/46283/image_1920?unique=a77c1aa
This front cap allows you to fine-tune the sound performance, flash mitigation, and backpressure of the silencer.
