CM9 bbl. in a PM9

[JimC]

I sent Kahr customer service an e-mail yesterday asking if the CM9 bbl. would drop into the PM9 pistol and work.

Their answer was "unfortunately they are not interchangeable."

I was going to buy a CM9 bbl. to chronograph loads and compare the readings between the conventional rifling of the CM9 bbl and the polygonal rifling of the PM9 bbl. in order to settle the never ending question as to which of the two produces the higher velocities.

I also have about 600 rds. of lead bullet 9mm loads that I wanted to shoot up and the CM9 bbl. w/it's rifling would have worked well for this.

I guess it ain't going to happen.

[rwblue01]

Based on my experience with Glocks.....you should not have a problem shooting some lead in the polygonal barrel. My suggestion is to run 100 rounds (or less) lead, then 20 rounds FMJ.

[Thunder71]

If they are not interchangeable I guess the internals aren't as exact as one might think.

I wonder what else is different?

[HeyGuysWatchThis]

I think you may have been just talking to one of their CSR reps, not a gunsmith. Don't we have several members on here with both guns? Seems to me this question should be pretty easy to answer. If the barrels can be swapped and then they feed rounds, that should answer the question.

[OldLincoln]

Based on my experience with Glocks.....you should not have a problem shooting some lead in the polygonal barrel. My suggestion is to run 100 rounds (or less) lead, then 20 rounds FMJ.

I have no experience so bow to others knowledge.... I read that the poly rifling gathers lead and lead bullets will deform to allow for that while FMJ will not (why they clean the lead out). The danger is to get the FMJ through a leaded barrel drives pressure way up. The recommendation I read was to clean the lead out before shooting FMJ.

Don't know anything other than what I read so it's certainly not gospel but wanted it out there for discussion before someone does it.

[JimC]

Based on my experience with Glocks.....you should not have a problem shooting some lead in the polygonal barrel. My suggestion is to run 100 rounds (or less) lead, then 20 rounds FMJ.

Thanks but I'm familiar with shooting lead thru polygonal barrels, I've been doing it for many years and I'm also aware that there could be negative consequences doing so.

Contrary to what you may believe, it's NOT a good practice to shoot jacketed bullets thru a barrel or any rifling configuration after shooting lead, especially if the lead is on the soft side and you get some build up. The jacketed bullets will actually cause the lead already on the bore to bond to the bore.

Shooting lead was only a secondary thought. As I said initially...I wanted the CM9 bbl. to do some chronograph testing and compare the two.

[JimC]

I think you may have been just talking to one of their CSR reps, not a gunsmith. Don't we have several members on here with both guns? Seems to me this question should be pretty easy to answer. If the barrels can be swapped and then they feed rounds, that should answer the question.

I don't know in what capacity Jay at Kahr Arms serves but he said " unfortunately they are not interchangeable" so his word is good enough for me before I lay out $140.80 for the barrel.

Send them an e-mail of your own and ask for a response from a gunsmith... service@kahr.com

[JimC]

I have no experience so bow to others knowledge.... I read that the poly rifling gathers lead and lead bullets will deform to allow for that while FMJ will not (why they clean the lead out). The danger is to get the FMJ through a leaded barrel drives pressure way up. The recommendation I read was to clean the lead out before shooting FMJ.

Don't know anything other than what I read so it's certainly not gospel but wanted it out there for discussion before someone does it.

Your are correct and this is what causes the "KABOOMS" as they are referred to in Glocks.

Plus the lack of support for the case head in the .40 S&W caliber models.

[jlottmc]

I dunno, that sounds a bit fishy about the bbls not being interchangeable. My wife has a CW45, and I have an older P45, all the parts I have messed with are interchangeable. I took the top end off, and swapped frames, and slide stops to prove a point to her. All good in my book. The cm9 bbl may need a little tweaking to be on a different gun, but most guns are like that to get that final fit.

[rwblue01]

Your are correct and this is what causes the "KABOOMS" as they are referred to in Glocks.

Plus the lack of support for the case head in the .40 S&W caliber models.

The 40 is a different animal. It is loaded with less margin for error.

The 9mm has a greater margin of error as you can see in the commercial loading with include +P and ++P loads.

I have done it with no ill effects. If you don't feel safe doing it, then don't.

[Ikeo74]

I sent Kahr customer service an e-mail yesterday asking if the CM9 bbl. would drop into the PM9 pistol and work.

Their answer was "unfortunately they are not interchangeable."

I was going to buy a CM9 bbl. to chronograph loads and compare the readings between the conventional rifling of the CM9 bbl and the polygonal rifling of the PM9 bbl. in order to settle the never ending question as to which of the two produces the higher velocities.

I also have about 600 rds. of lead bullet 9mm loads that I wanted to shoot up and the CM9 bbl. w/it's rifling would have worked well for this.

I guess it ain't going to happen.

Jim, to settle this once and for all, just buy a CM9 to add to your collection and go shoot and test them side by side.

[JimC]

Jim, to settle this once and for all, just buy a CM9 to add to your collection and go shoot and test them side by side.

Yup, just what I had in mind...NOT!

[BEARDOG]

Yup, just what I had in mind...NOT!

Oh come on Jim, they are practically giving away CM9's at Bud's...only $386 shipped!
http://www.budsgunshop.com/catalog/p...ducts_id=76031

Then you can sling lead in one hand, and jacketed in the other!!!

[jocko]

humm

Jim, to settle this once and for all, just buy a CM9 to add to your collection and go shoot and test them side by side.

I find that hard to believe. I would sur elike to know what tyhe diffrerence is EXTERNALLY..

[kayl]

Oh come on Jim, they are practically giving away CM9's at Bud's...only $386 shipped!
http://www.budsgunshop.com/catalog/p...ducts_id=76031

Then you can sling lead in one hand, and jacketed in the other!!!

Even cheaper at Cheaper Than Dirt (Can't link, at work) - I think they're at about $340-$350 shipped!