The Tisas 1911 Stingray (4.25-inch barrel) in .45 ACP typically uses an 18 lb to 18.5 lb recoil spring from the factory, which is standard for most 1911 Commander-length models. It features a specialized flat wire spring system designed to handle the compact size and caliber.

Optimal Performance: For consistent function, especially with full-power 230gr ammo, a 18.5 lb spring is recommended.
Alternative: Some users may opt for a 16 lb spring for lighter loads, though 18 lb is the standard starting point for this configuration.

The recoil spring weight is typically around 16 pounds, an industry for most .45 ACP 1911 models.

Hi Tom and welcome. The Tisas 1911 sting ray in 45 cal. comes with a 16lb recoil spring. Cheers, stay safe and enjoy!