P40/covert/PM40

[BJSM16]

Anyone interested in a .357sig bbl for their P40? I talked to Storm Lake barrels about this and they will be willing to make a run of 10 or so if there is 5-7 people interested in one. Let me know and I will pass it on to Storm Lake. I will keep everyone posted on if it need to be a group purchase. Thanks, Brandon.

[Tork]

very interesting... is the sig 357 a rounder nosed bullet? it may feed easier... what is the ballpark price. i am interested, but cant commit

[BJSM16]

Storm Lake told me a rough estimate for a run of 10 would cost about $100 each. This is an estimate taken due to the fact that the exterior shape of the Kahr barrel is similar to a Glock barrel. I will send them my barrel to blueprint for production if there is enough demand for the .357sig. They just made a new run of blued G24 extended and threaded barrels that I ordered and the cost was only $105 shipped. I thought the price was very reasonable. I have not had a chance to shoot the barrel but they did a wonderful job and the threads were very clean cut and square shoulder for suppressors. All the other barrel companies wanted twice as much for the same barrel. Thanks, Brandon.

[Tork]

100 is very reasonable. please count me as extremely interested

[SearTripper]

BJSM16 . . .

I'd be very interested too ! ! ! That's a great price and whoever asked if it might feed better, well, it sure would ! ! ! Any of those bottle-neck shaped ctgs feed better than straight-walled ctgs!

Did anyone ask Kahr if the recoil impulse would be OK from that ctg in the PM-40 ? ? ? ?

[LewisQ]

Always interested in anything 357 SIG... Count me in :)

[hd67xlch]

of those barrles in .357 sig. Just let me know when where and how long we are talking.

later

[Tork]

i am getting more excited about this as the day goes on...
this will also take care of the round hitting my slide stop...:rollsmiley:

it won't be 'polygonal' rifling will it??

[AZ Traveler]

I have a question. Are we talking about both PM40 and P40 barrels? I ask this because they do not use the same barrel.

The P40 and P40 Covert use the same 3.5 in. barrel and the slide. The PM40 uses a 3.0 in. barrel and slide. I believe, you can not put a 3.5 in barrel in a Kahr designed for a 3.0 in barrel. The barrel hoods are slightly different designs and dimensions. They look similar until you put them side by side.

[SearTripper]

Good catch, AZ ! ! ! I have the PM-40 myself. Love the little bugger! It would certainly be even cooler (if that's possible) in .357 Sig !!!

[BJSM16]

I talked to Kahr about this but they would not give me any info on this issue. They acted like they did not have time for my question or did not want anyone to make any parts for it. I will look into the differences between the barrels of the P40 & PM40. I assumed they were the same just different lenghths. I will let you all know when I find out. Thanks, Brandon.

[SearTripper]

What I'm talking about Brandon, is the speed of the slide during recoil of the .357 vs the .40. The .40 is pretty intense I know but the .357 is very intense by the same token! Now I'm not sure one is greater than the other but this is what I wanetd to find iout - if shooting the .357's will batter the slide/receiver to death ! ! !

[Catbird]

So, what is the current status of this endeavor?

[SearTripper]

I'm still interested in having a .357 SiG bbl. for my PM-40, too ! ! ! I'm still concered about this question I raised in a post I wrote above, Did anyone ask Kahr if the recoil impulse would be OK from that ctg in the PM-40 ? ? ? ?
"Did anyone ask Kahr if the recoil impulse would be OK from that ctg in the PM-40?"
I would think that the recoil impulse of the SiG Ctg. would not be any more than that of the S&W one, though . . .

[LewisQ]

I doubt it will be any problem. Most guns (SIG, Glock and Steyr I know for a fact) can fire 40 or 357 with a barrel swap.

In fact last year, SIG had one of the guns of the month that came with both barrels.

[BJSM16]

I finally got to talk to a Kahr engineer and was told that they have never tried any testing with the .357sig and he did not know if it would work. This would be a project that someone would have to take on their own. The engineer told me that I should measure and weigh other like handguns that have the convertability between .357sig and .40S&W and try it at my own risk. I just finished converting my Firestar M40 to and Kel Tec sub rifle to .357sig. I found a M43 9mm barrel reamed it out and stamped it with .357sig. I reamed out the sub rifle barrel, got a .40 bolt and added more mass and an extra recoil spring to the bolt. I have to fire them yet to see how they shoot. It is pretty cool. The worst case scenario with converting the P40 would be that the gun breaks. My Kel Tec blew into two pieces the first time I converted it. That is why I had to add mass to the bolt. I will be looking into adding mass to the P40 slide and maybe an extra or heavier spring. I will keep all of you updated. If anyone has any feedback please post it here. I would also like a picture of a P40 and PM40 barrel side by side to see the differences if anyone has them both and would post that here. Thanks and I will keep you updated.
Brandon.

[Tork]

i will risk blowing my pos p-40 up....
continue to count me in.

as for wether the gun will take it... what are the kinetic energy differences btw the 40, and the 357...
someone important stated something about action=reaction... so if the KE values are the same, won't the gun abuse factor be the same?

[reelhook]

I believe that Kahr has already tried this. I think that you will find the slide speed way to fast and vialent for the Kahr.

[BJSM16]

Kahr told me that they did not every try this because of not enough call for their gun in that cartridge. I do know that the .357sig has a faster timing than the .40S&W. That is why my Kel Tec blew up. The bolt opened too early before the high pressure could subside. That is why I had to add weight to the bolt. That was for a blow back operated action. It should be a lot less for a lock breach action. I am thinking of just getting a barrel made and seeing what happens. The only thing is that Storm lake needs at least 6-7 orders to run a lot. I will let you guys know what I can get worked out. Thanks, Brandon.

[SearTripper]

Originally posted by reelhook
I believe that Kahr has already tried this. I think that you will find the slide speed way to fast and vialent for the Kahr.

In light of this I guess I'll haveto graciously bow out. I love my little PM-40 too much to blow it up or damage it from too violent a recoil impulse ! ! ! !

[Tork]

so, how about a good 'ol BTTT

[mecenas1991]

I am mildly surprised that Kahr even wanted to talk to anyone about the project that carries enormous legal liability.
Hate to pour a bucket of cold water on you enthusiasts out there, but as long as you are doing it on your own - your action is your own risk. If you try to involve a manufacturer - don't be surprised that no one will pick up the subject.
Unless you have a testing laboratory or work very closely with SAAMI, you are risking not just a value of a gun blown to pieces - you are risking your life, IMHO

[smogonly]

Even if it does work, it would be pretty hard to explain in court if you had to use it for self defense.

[mecenas1991]

I know I will earn a wrath of hatred for this post, but I often wonder why would someone want to make something out of a perfectly designed little pistol that would serve a completely different purpose than originally intended.
I doubt you would make a Corvette out of Ford Pinto by putting a Corvette engine and transmission in it. It would still be a Pinto.
If you want a 357 Sig pistol buy one designed for that cartridge. Many firearms manufacturers spent considerable amount of money designing a firearm for that particular caliber - why fool around trying to put a round peg in a square hole playing with something that is dangerous in and of itself. I guess for lack of anything better to do..???

[SearTripper]

mecenas1991

Perhaps you didn't know that the .357 SiG is a necked down .40 S&W!!! That in and of itself renders your proposterous exagerations of the difference moot. Therefore, those statements regarding the differences you cited must have their basis in your lack of knowledge of the ctg.

Not NEAR that amount of difference. Recoil impulse is sharper but that's probably all.

[stiletto raggio]

To back up SearTripper, nobody I have heard of has designed a gun specifically for the .357 Sig. It is a necked down .40, an all of the guns made in .357 are nothing more than .40s with different barrels. The .40/.357 swap is done all the time. and if it weren't for the fact that I have no use for the .357 sig cartrige, I would likely have a few conversions myself.

Go forth with your project. It is sound in my eyes.

[Tork]

i feel the sig cartridge would solve all our feeding nightmares...