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It is a 70 series, and has a barrel bushing https://www.americanrifleman.org/content/nra-gun-of-the-week-tisas-1911a1-us-army/

series 70 trigger commander and standard use barrel bushing

Bobby, this Tisas SDS has a Series 70 Firing System. Without the Series 80 firing pin safety. The FP safety keeps the firing pin fron contacting the primer for a possible AD when the pistol is dropped, muzzle down, on a hard surface. Series 70 up side is a cleaner trigger pull.