CMMG Inc Barrel PS90 10.4in. 1-9 Twist 5.7x28 Chamber Threaded M12x1.0 LH 4150CMV. Pair this with a CMMG PS90 Flash hider or thread adapter to complete your SBR. Specifications for CMMG Inc PS90 5. 10.4in. Barrel: Manufacturer: CMMG Color: Grey Barrel Length: 10.4 in Barrel Twist Rate: 1-9 Barrel Material: 4140 Chrome Moly Gun Model: FN PS90 CMMG Inc PS90 5. 10.4in. Barrel 2CM-BRI-57DF1C7 10.4 4140 Chrome Moly Salt Bath Nitride Finish 1:9 Twist 5.7 28 Chamber Threaded M12x1.0 LH Package Contents: CMMG Inc PS90 5. 10.4in. Barrel 2CM-BRI-57DF1C7 What firearm models does the manufacturer say CMMG Inc PS90 5. 10.4in. Barrel is compatible with? The manufacturer says that CMMG Inc PS90 5. 10.4in. Barrel is compatible with FN PS90CMMG Inc 57DF1C7: Barrel 10.4in. PS90 4150CMV CL 1:9 5.7x28