Thanks for the replies guy's. I jumped on them when they first came out. Love them in 4 in. gun in 45. There was only a 17lb. in 5in. back then, felt undersprung with major or carry ammo. More spring weights avalible now, may re-evaluate in 5in. guns. Was looking for a little input on their use in 4.25 guns, Commanders.I want to run one in a lightweight Commander without a guide rod adding the weight and was concerned with spring binding.