CMMG 57DA5BE Flash Hider  Black Steel with M12x1 LH Threads for 5.7x28mm FN PS90
                            https://www.tandktactical.com/shop/815835017105-cmmg-57da5be-flash-hider-black-steel-with-m12x1-lh-threads-for-5-7x28mm-fn-ps90-7470
                            https://www.tandktactical.com/web/image/product.template/7470/image_1920?unique=aaaff55
                            CMMG's FNH P90 Flash Hider is compatible with a short barrel on your PS90 SBR build.