New recoil spring for cm9

[Benaiah]

Anyone ever use the Wolf recoil spring for the PM9?

[wyntrout]

I've had one for a year, but haven't used it, yet. It came with a striker spring, too. I just ordered a bunch of springs from Wolff... all kinds of stuff for spares. They didn't have a P40 recoil spring, but I ordered a K40 one to compare with the original. They say it's NOT for polymer pistols, though.

The magazine springs for 6-7 round .40 mags and 8-round 9mm mags are the same, so I bought a 10-pack of those. I also got a 3-pack of 5-lb striker springs to try. I looked and looked for stuff to add to my order, but they still don't cover all of the Kahr pistols... and NO .380 or .45 springs.

I did figure out which one I needed for my Springfield Champion and ordered one of those... 22lb. I had bought a 1911 spring in an order from CDNN, I believe, for $2 or so... just to have something to cut to size if needed.

Just rambling on.... Building up some stocks of spare stuff. I don't throw anything away that might be of some kind of use... the problem comes when I can't remember where I put it!!

Wynn

[gb6491]

I've had one for a year, but haven't used it, yet. It came with a striker spring, too. I just ordered a bunch of springs from Wolff... all kinds of stuff for spares. They didn't have a P40 recoil spring, but I ordered a K40 one to compare with the original. They say it's NOT for polymer pistols, though....
Wynn

Wynn,
I think that "NOT for polymer pistols" thing only applies to the MK9/MK40 recoil springs, guide rod sets, and springs/guide rod set combo.
Regards,
Greg

[wyntrout]

Thanks, Greg. I was just going to compare them and be cautious about any "trimming" when the time comes. I don't think most people realize the difference in the open and closed ends of the springs. The closed end is a slightly smaller diameter to grip the guide rod. If this isn't against the flared end of the guide rod, it changes the whole dynamics of the recoil system.

When the nut flew off the end of my PM45 and Kahr sent me a whole new assembly, I used the old outer spring because it only had a few hundred rounds use. The new one is longer and I'll compare and adjust the new one when I need it.

I can't believe that Wolff still hasn't expanded their coverage of the Kahr pistols to include the .380 and .45's. I asked them about that several times.

Wynn

[gb6491]

...
I can't believe that Wolff still hasn't expanded their coverage of the Kahr pistols to include the .380 and .45's. I asked them about that several times.

Wynn

I agree! I wonder if this is the result of a business agreement between them and Kahr?

BTW, does your Champion use a full length guide rod? If so and it's .250" diameter, you might want to check out ISMI's flat wire spring:
http://www.ismi-gunsprings.com/
I buy mine here: http://www.egwguns.com/recoil-spring...ecoil-springs/
Regards,
Greg

[wyntrout]

My S.A. Champion has a 4" barrel and uses a single-piece guide rod with a 22-lb spring.
I have one coming from Wolff. I don't know if it will require alteration, though.

Wynn

[Russ]

I have seen pictures on the web comparing older PM9s with newer models. The newer model is slightly longer where the recoil spring protrudes from the poly frame just below the barrel. Could that explain the longer recoil spring ? The article even mentioned the design change added a little weight.

[Scoundrel]

I just got my replacement CM9 recoil spring today.

Not only is it considerably longer (because it has not settled in yet), but it also has more steel. Notice the coil runs around another half-turn.

When I assembled it, I found that there seems to be a spot where the slide "catches" and I have to force/wiggle it past that point during assembly.

Once it is assembled, the slide is stiffer than I am used to, and will not lock back. I'll let it "set" overnight in the CM9, maybe rack it a few dozen times, and then see if it will lock back. If not, I will probably clip the coil to the same spot as the old one and try again.

I dunno, I really like my Kahr, but I've been seeing a lot of problems with Kahr screwing things like this up. A replacement spring should just fit right into a perfectly working CM9 without any issues.

P.S. I put the old recoil assembly/spring back in and everything was peachy. Put new one back again, no slide lock.

[bonjorno2]

interesting, what was going on with your first recoil assembly?

[Scoundrel]

interesting, what was going on with your first recoil assembly?

I have exceeded 2,000 rounds through it and bought another one to have on hand for eventual replacement. Of course I wanted to check out the new one, to make sure it works OK before I need it.

[bonjorno2]

2000 rds thru the cm9, wow... I have a feeling i might not get to that number for a long time... I shoot little carry often.

[Scoundrel]

2000 rds thru the cm9, wow... I have a feeling i might not get to that number for a long time... I shoot little carry often.

I had a lot of work to do on hitting my targets, getting good groups, learning how the CM9 likes to be treated, figuring out WTF was going on with nosedives in the 7rd magazine, etc.

And playing.

[hoghunter]

This reminds me that I need to measure and count the loops on my reworked recoil spring. Since I got the CM9 back from Kahr it has worked great! all they did was cut the recoil spring shorter, so I need to measure now before it gets broke in so when I need to order a new recoil in about 1,500 rounds I know where to cut it.

[TucsonMTB]

Once it is assembled, the slide is stiffer than I am used to, and will not lock back. I'll let it "set" overnight in the CM9, maybe rack it a few dozen times, and then see if it will lock back. If not, I will probably clip the coil to the same spot as the old one and try again.

I dunno, I really like my Kahr, but I've been seeing a lot of problems with Kahr screwing things like this up. A replacement spring should just fit right into a perfectly working CM9 without any issues.

P.S. I put the old recoil assembly/spring back in and everything was peachy. Put new one back again, no slide lock.

Yeah, I had a similar experience with my PM40 when it came back from Kahr warranty service with a new recoil assembly.

Mine didn't become easy (possible?) to lock back by hand until after shooting a few mags worth of ammo. If you put in an empty magazine and really pull back on the slide, it should lock even before shooting. Otherwise, clipping to match the number of complete coils is probably a good idea.

I share your astonishment that Kahr doesn't seem to understand this kind of thing. They are, after all, a gun manufacturer.

[JFootin]

I just got my replacement CM9 recoil spring today.

Not only is it considerably longer (because it has not settled in yet), but it also has more steel. Notice the coil runs around another half-turn.

When I assembled it, I found that there seems to be a spot where the slide "catches" and I have to force/wiggle it past that point during assembly.

Once it is assembled, the slide is stiffer than I am used to, and will not lock back. I'll let it "set" overnight in the CM9, maybe rack it a few dozen times, and then see if it will lock back. If not, I will probably clip the coil to the same spot as the old one and try again.

I dunno, I really like my Kahr, but I've been seeing a lot of problems with Kahr screwing things like this up. A replacement spring should just fit right into a perfectly working CM9 without any issues.

P.S. I put the old recoil assembly/spring back in and everything was peachy. Put new one back again, no slide lock.

I am counting 14 1/2 loops on the old spring and 15 on the new one. You should email Kahr CS with this pic and ask them what's up. I'd like to know.