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Dead Air Armament Thread Adapter FN 5.7 1/2x28 TPI DA422 DA422-EDEMO1
You need to have a threaded barrel on your 5.7. The thread pitch on the 5.7 is 10X1mm RH, due to the diameter of the smaller round. This adapter converts the 10X1mm to the more common 1/2X28 thread pitch
This will not fit the PS90 because for some reason FN uses a different thread pitch on the PS90 barrels. The PS90 has a M12x1.0 LH thread while the Five-Seven has a 10x1mm RH thread.
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