Kahr recoil spring or alternative?

[Steeltoes]

Are both ends of the Wolff springs close ended or is one end open like the factory Kahr? Does anyone know why they don't use a single flat spring that is captive on the guide pin?

[wyntrout]

I have an unopened PM9 set from Wolff rated 20.5 lbs. The outer spring has an open end and 12 coils. The smaller diameter inner one is half again as long and both ends are closed. There's also a striker spring as well. These are just loose springs. You would have to take the inner apart and use the original parts along with Red Loctite on the guide rod end cap nut.

The compact polymer pistols require two springs in all?/some models because one spring wouldn't give the action needed in the design. It's what they came up with in testing the design. I'm sure they would have rather had just one spring like the K's and my P40.

Hmmm... I just ordered a bunch of springs from Wolff and I see that the 20-lb K9 recoil spring and striker spring fits the K40 as well. I'll have two dual-use sets now.

Wynn

[Steeltoes]

Just for giggle....I put my recoil spring and rod in from my Glock 23...the rod stick out...lol, but if the spring was an 1/4" shorter it would lock back...I never fired the weapon this way...nor recommend it...I was just curious...

[TucsonMTB]

You would have to take the inner apart and use the original parts along with Red Loctite on the guide rod end cap nut.

Which is not as hard as it sounds. The forces involved are easy to overcome with normal hand strength if you use a paper towel as padding.

My PM40 assembly nut was walking out! I noticed it before it launched while cleaning after a range session. Took it all apart for degreasing before applying Loctite. Not hard at all to get back together.

[wyntrout]

Yours was loose already. The nut was supposed to be "permanently" sealed with the Red Loctite, requiring a lot of torque and heat to about 500° to break the bond. Impurities like oil or other solvents don't allow a good bond. "Stuff" happens.

Wynn

[TucsonMTB]

True. But it is a small part and all metal, so you can achieve the temperatures you need with a butane lighter.

[wyntrout]

If you leave the assembly in the pistol with the slide locked back, it's real easy to work with. Flames are hot... you sure don't need a torch, but one of those butane mini-torches works real well... without getting uncomfortably hot on your hand like those lighters can. That torch I bought is the second or third different one and THIS one holds the butane... doesn't let it leak out... for years... real handy for lots of uses.

Wynn

[TucsonMTB]

Great idea! I just clamped mine in the silicone rubber soft jaws of my vice. Worked out well enough. The profile of my round nut was not quite right causing it to hang on the slide occasionally!

Fixed that. And, blackened the round nut for the fully blacked out mall ninja look on the DLC gun.

Come to think of it, the blackening chemicals may be what did in my original Locktite. Might have to keep an eye on that puppy.