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Item Number: 651C22
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Detailed Description

Recommended Use: Compact / Professional Size 4" .45 ACP shooting +P JHP self-defense ammunition with a power factor of 180,000 to 200,000 (Velocity x Bullet Weight = Power Factor)

Average Service Life: 40,000 Rounds

NOTE: This is the standard recoil spring we install in our compact .45 ACP pistols.

This Wilson Combat innovation solves the issue of recoil spring fatigue in compact 1911 handguns and will greatly enhance overall compact pistol reliability.

Compact size 1911’s are noted for being extra hard on recoil springs and as your stock recoil spring takes a set and tension is reduced, the magazine spring will struggle to keep up or a last round feed malfunction can occur.

Improves Cycling and Overall Operation

  • Improved Recoil Spring Life
  • .250" Rod Diameter
  • 22# Chrome Silicon Flat-Wire Recoil Spring
  • Longer Free Length with More Coils
  • Resists Tension Loss Much Better than Conventional Round Wire Springs


Compatible with the following handguns:

  • Wilson Combat 4" Compact (.45 ACP) - Tactical Supergrade Compact, Ultralight Carry Compact, CQB Compact, CQB Light-Rail Lightweight Compact, Bill Wilson Carry Pistol, KZ-45 Compact

  • Wilson Combat 4" Professional (.45 ACP) - Tactical Supergrade Professional, CQB Light-Rail Lightweight Professional, Professional, Professional Lightweight

  • Kimber 4" Compact (.45 ACP) - Compact Stainless II, Compact CDP II

  • Kimber 4" Professional (.45 ACP) - Pro Carry II, Stainless Pro Carry II, Pro Carry HD II, Pro TLE II, Pro TLE/RL II, Stainless Pro TLE II, Stainless Pro TLE II (LG), Stainless Pro TLE/RL II, Pro Crimson Carry II, Tactical Pro II, Eclipse Pro II, Eclipse Pro Target II, Pro Covert II, Pro Aegis II, Pro CDP II, Pro Raptor II, Stainless Pro Raptor II, Super Carry Pro, Super Carry Pro HD

  • STI (.45 ACP) - Tactical 4.0, Ranger II

  • BUL Ltd. (.45 ACP) - M-5 Commander

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: 22# Flat-Wire Recoil Spring,

1) Is the flat wire spring compatible with a full length guide rod?
No-We do not offer a full length guide rod at this time that is compatible with the flatwire spring. The inner diameter of the flat wire is smaller and the spring requires a special guide rod which is why we offer the spring as a kit.

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.

Cautions and Installation Test Procedure

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.

 Product ReviewsClick here to review this item
1911 Commander 45ACP
Sad the Wilson don’t make a Commander 1/4” guide rod. But this spring does say for +P , but I had no issues running standard ammo. The resistance of the 22# ISMI feels on par with the standard 20# spring. Of course 4.25” Commanders OEM #18. Only have about 500 rounds, so I can’t verify Wilson claim of 40,000. ISMI guarantees 10,000 or 1 year.

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