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Hi Ivan and welcome. Yes and the thread pitch is M12x1.0 LH. This adapter will increase the suppressor options for you : https://www.midwayusa.com/product/1019342130?pid=909885

The flash hider/brake is integral to the barrel shroud and is pinned in place. The barrel shroud itself is necessary to hold the barrel in place and removing it is generally only done to facilitate installing a 10.5" barrel which requires SBR paperwork. The adapter suggested by James G is generally used only in tandem with the 10.5" barrel. FN also generally does not recommend using a suppressor with the PS90 due to the increased wear and tear it causes on the polymer frame and internal parts. That all being said, it is possible yet expensive and time consuming to suppress. A much cheaper and easier way to shoot 50 round magazines of pricey 5.7x28 suppressed would be a Kel-Tec P50, though the PS90 is definitely cooler in my book.