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5/6 usually use same Springs; measured at coil compression not free Length, Wilson combat https://shopwilsoncombat.com/Recoil-Spring-5-Full-Size-24-Lb/productinfo/10G24/ ------------- Kit here https://shopwilsoncombat.com/Flat-Wire-Recoil-Spring-Kit-Full-Size-10mm_460-Rowland-24-Lb/productinfo/775/ -------- Or check out Wolff's Springs for delta elite https://www.gunsprings.com/COLT/1911%20GOV'T%20PISTOL/cID1/mID1/dID1#3

Shaun, Wolff sells "Longslide" recoil springs. I would go with a Harrison Small Radius Firing pin stop and a heaver mainspring, also available from Wolff. Scroll down this page: https://www.gunsprings.com/COLT/1911 GOV'T PISTOL/cID1/mID1/dID1 and find this header: Recoil Springs - 1911 Longslide Modifications