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I have this exact pistol and it does have the 1911A1 ( arched) mainspring housing as shown

Hi and welcome. This model has an Arched Mainspring Housing. Tisas 1911 Pistol Specifications and Features: SDS Imports/Tisas Item Number: 10100114 Semi-Auto Pistol .45 ACP 8 Round Magazine 4.25" Cold Hammer Forged Barrel Forged Carbon Full-Size Frame Commander Length Slide Arched Mainspring Housing Rear Slide Serrations Government Style Trigger Ring Style Hammer Government Style Safety Enhanced GI style Sights Series 70 Internals Black Grips Weight: 2 lbs 3 oz Black Phosphate Finish