CMMG's PS90 SBR threaded barrel is constructed of 4150 chrome moly vanadium with chrome lining and a maganese phosphate coating. It is 10.4" long and is chambered for FN 5.7x28mm caliber.
MANUFACTURER
CMMG
CALIBER
5.7X28MM
CMMG 57DF1C7 BARREL SUB-ASSEMBLY 5.7X28MM 10.40" FOR PS90