The highest quality recoil springs from ISMI in 11lbs. Will work with most 1911 spring guide rods to tune your recoil system.

Made for 1911 & 2011 pistols, but will also fit full size Springer Precision Sig P320 and P320 X5 1911 guide rods.

These work with 4.5″ and 5.25″ Springfield XDM models and 5″ XD models, if you are using it on a 4″ XD model you will need to trim your springs.