Great choice for your FN PS90 SBR project.10.4"4150 Chrome Moly VanadiumChrome LinedMaganese Phosphate Coated1:9 Twist5.7x28 FN ChamberedThreaded M12x1.0LH CMMG 10.4" PS90 Barrel$299.99PriceQuantityOut of StockNotify When Available