WILSON COMBAT - Wilson Kit # 321

This is the best 10 bucks you can spend on your J frame revolver. The trigger pull was immediately improved and installation was relatively easy, even for a non-gunsmith.

I purchased a new M&P 340 about a week ago. Lots of dry firing, but the trigger was too much. I installed the 13 lb. rebound spring and polished the internals (first time). It was much better. I went back and installed the 8 lb. hammer spring. It's so much better with still a lot of dry firing. I took it to my range this morning and fired 50 rounds of target ammo and 15 rounds of carry ammo. I realize it's only 65 rounds, but no issues and the trigger is so much better. 65 was enough with this little guy.

I installed this on my wife's M640, a DAO J-frame. With this kit it will be far easier to shoot and thus shoot more accurately. The action smoothed up and lightening the trigger pull helps. Highly recommend Now I have to install the kit in my other Smith revolvers.

I didn't, and doubt that most shooters think of Wilson Combat as revolver experts. Think again. I installed their spring kit for S&W J Frame in my Model 37. Before: 12+ lb. double action, 5 lb. single action pull. After: 8.5 lb. double and 3 lb. single action, testing 100% reliable ignition with 5 different loads from 4 different brands of factory ammo, tested double and single action! Easily installed after watching some Youtube instructional videos. The only special tool I recommend is the inexpensive S&W trigger return spring tool from Brownells. I installed the hammer spring and the lightest of the trigger return springs, which functions just fine. Pretty much same story with the Wilson K/L/N Frame spring kit in my Model 10.

Was looking to buy another revolver for the Wife until I installed the hammer spring and the middle trigger return spring in my S&W Model 60. Friends now want the kit for their J frame.