DAA Thread Adapter, 1/ 2 x 28 RH, Fits FN 5.7, Black Finish DA422 Available to order on-line. Ships in 5-14 days Price: $45.00 Description Details Reviews Shipping info Thread adapter for use with your Mask-HD. For FN 5.7 1/2X28 thread pitch UPC: 810042341135Manufacturer: Dead Air ArmamentModel: DA422Category: PartsOtherStock: Ships in 5-14 business days.Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.