Recommended Use: Full-Size 5" .38 Super +P full charge target or self-defense ammunition or .45 ACP shooting target ammunition with a power factor of 140,000 to 165,000 (Velocity x Bullet Weight = Power Factor)
Average Service Life: 40,000 Rounds
The longest lasting handgun recoil spring made - our testing has indicated that these springs have a service life up to ten times greater than conventional coil springs.
Improves Cycling and Overall Operation
CAUTION: Safety glasses should be worn at all times when replacing or working with firearm springs. Failure to follow this safety precaution could result in bodily injury.
Package Includes: 15# Flat-Wire Recoil Spring
1) Is the flat wire spring compatible with a full length guide rod?
Yes-Only with the full length flat wire guide rod (#25GRFW). The inner diameter of the flat wire spring is smaller than a conventional round wire spring requiring a flat wire specific guide rod.
2) Is a Shok Buff required?
A Shok-Buff is optional on the 5” flatwire guide rod. It is not recommended for use on the 4” kit since it can reduce slide travel.
3) Can I shoot +P ammunition with this kit?
Yes-since flat wire springs don’t lose their length over time like round wire springs they cushion your frame more effectively over time. Flat wire springs also compress in a more linear fashion which makes them more tolerant of a wider variety of loads and grips.
HOW TO TEST TO MAKE SURE YOU HAVE THE CORRECT RECOIL SPRING WEIGHT FOR YOUR AMMUNITION: Go to the range with your pistol and a magazine that will positively lock your slide to the rear when you slowly retract the slide with the pistol empty. Load one round of the desired ammunition in the proven magazine, load the pistol and fire the single shot holding the pistol in your strong hand, but grip the pistol fairly loose. If the pistol consistently (5 to 10 shots is adequate) locks the slide to the rear, the recoil spring is not too heavy for your ammunition. A recoil spring that is 1-2# below the weight where you begin to have failures to lock open is ideal for your ammunition.