FN PS90 SBR - 5.7x28 - 10.5" - NIB, Custom upper for MRO Red Dot Caliber .223, 5.56mm Weight 12.5000 Length 6.25 Diameter 1.5" Decibel Reduction / Output 31dB Full Auto Rated Yes Mount Direct Connect / Thread On Thread Pitch  1/2x28 Color Black Finish Cerakote Materials High Strength, High Temp, Corrosion Resistant Alloys Can Be Disassembled No Manufacturer Griffin Armament Warranty Lifetime Model No