P99 vs MR9

4199 Views 23 Replies 9 Participants Last post by ShipWreck, May 15, 2020

djmg412

Discussion Starter · Nov 14, 2018

Threaded barrel for my MR9? I just bought a threaded P99 barrel for $63.75 shipped. First off, was the barrel a good purchase at that price? Second Question is, has anyone tried to run their P99 barrel in their MR9 slide? And just to get the basics out of the way they are both the standard 4" AS. (If this is already in a thread I missed, please link me)

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imaoldfart

· #2 · Nov 14, 2018

Was that barrel made in the good ole U S of A or Taiwan. New or used?

Kar98

· #3 · Nov 14, 2018

The P99 and the MR9 are both AS, the AS was just added to the regular P99 as other versions became available. And the barrels/slides from one will fit on the other. MR9 tolerances seem quite a bit tighter though. Haven't tried running them that way though.

djmg412

Discussion Starter · #4 · Nov 15, 2018

Wather barrel?

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djmg412

Discussion Starter · #5 · Nov 15, 2018 (Edited)

OF - I think made in germany? date stamp says 2014?-BE ...used

Kar98 - MR tolerances are very tight. i noticed this after the purchase of my SW99c, which has plenty/excessive play in the barrel with the slide locked back. (i think this is because of the flared/tapered barrel.) MR has no wiggle at all!

I need to buy a WALTHER P99 too... although im still holding out for a 9mm 1st gen in od green and/or 1st gen satin slide. then ill get a new one, i just dont really care for the extended magazine release on the new ones... (i fat finger it and drop the mag on accident with my short stubby fingerlets. lol)

imaoldfart

· #6 · Nov 15, 2018

I'd say that's a good price for an actual 'Walther' barrel.

balance

· #7 · Nov 16, 2018

That's an excellent deal on your end. You could expect to get at least double that (likely more) if you chose to resell it.

That is a factory Walther threaded barrel. Where did you get it from? What is the thread pitch? Walther has made threaded barrels with at least three different types of thread pitches, with two being left-handed and one being right-handed.

djmg412

Discussion Starter · #8 · Nov 17, 2018

balance said:
That's an excellent deal on your end. You could expect to get at least double that (likely more) if you chose to resell it.
-i'll buy a Walther p99 before I'd sell it.

That is a factory Walther threaded barrel. Where did you get it from?
-ebay lol

What is the thread pitch?
13.5-1 LH

Walther has made threaded barrels with at least three different types of thread pitches, with two being left-handed and one being right-handed.

Interesting. 👍

djmg412

Discussion Starter · #9 · Nov 20, 2018

Kar98 said:
The P99 and the MR9 are both AS, the AS was just added to the regular P99 as other versions became available. And the barrels/slides from one will fit on the other. MR9 tolerances seem quite a bit tighter though. Haven't tried running them that way though.

Got the new barrel today, and the slide Will NOT lock out of battery! 😿 We're you able to get you barrels to function when swapped?
Seems like if I was to work it back and forth for a little while, it would eventually loosen up enough to release on its own, without a little nudge from behind. It's pretty darn tight in there. If you look at the second picture the slide lock isn't even engaged. It's wedged in there enough to hold itself back. (I know, "easy there muscles!" I didn't hurt anything. It might need some more convincing though... had to take a mallett to my Ithaca Barrel to get it to thread! lol, it works now.😁)

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djmg412

Discussion Starter · #10 · Nov 20, 2018

MR9 or P99 question. Either or...

Are there any other differences between the .40s&w and 9 mm pistol inner workings besides the barrel and magazine follower?
-or-
Can you put a 9mm barrel in a .40s&w slide and it will go bang?

*asking for a friend. 😉

imaoldfart

· #11 · Nov 20, 2018

A 40 caliber barrel is a larger 'outside' diameter than a 9mm. Meaning the hole in the end of the slide is sized to accommodate a 40 barrel or a 9mm barrel. You can put a 9mm barrel in a 40 slide.....the hole in the end of the barrel will be TOO big....this is certainly not a shootable combination...just for chitz and grins. You can't put a 40 barrel in a 9mm slide....again, the hole in the end of the slide is too small.

ddiwd445

· #12 · Nov 20, 2018

There aren't that many reviews of them out there, so I'm guessing not too many people are buying them.

Walther makes the frame, and Magnum Research makes the slide and barrel out of stainless steel I believe, while the P99 uses carbon steel for these parts. Mags for the SW99, P99, and PPQ should all work with this pistol. It looks like it uses a universal rail with three notches while the current P99 uses the S&W rail with one notch. The mag release is the short version on the MR9, which means they copied the first generation P99 mag release instead of going with the current generation's longer mag release levers.

The good news is that the pistol it copied is one I would consider a good pistol. I think I would rather get the real P99 though, as it is covered by S&W CS (I've heard nothing, good or bad, about MR CS), and Walther has stated that they have no plans at the moment to discontinue it, while the MR9 doesn't seem to be selling or getting much attention for the time it has been out on the market.

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Kar98

· #13 · Nov 20, 2018

Close-up of the MR9:

And two 99s:

S&W has NOTHING to do with the P99s, not with customer service, not with importation, not with distribution. S&W used to be the distributor for Walther for a few years and made the US market PPK and PPK/S, while Walther made the S&W M&P 22 for them.

Also, while I have seen serial number "eight" of the MR9, I haven't seen any serial above 7,000 yet. The model is discontinued.

Not sure what grade of steel the slide is made of, but the MR9 barrel is 4140 CrMo steel.

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balance

· #14 · Nov 20, 2018

You can put a 9mm barrel in a 40 slide.....the hole in the end of the barrel will be TOO big....this is certainly not a shootable combination...just for chitz and grins.

This, and the breechface is only wide enough for the cartridge that it was designed for. Using a 9mm barrel on a .40 slide, the barrel would probably be loose on the chamber end as well.

djmg412

Discussion Starter · #15 · Nov 30, 2018

**UPDATE ON THREADED BARREL FIT**

Ok, so after much looking i have figured out the reason the slide sticks on the MR9 with a P99 barrel... as it turns out, even though the barrels are the same size and lockup like a glove they are in-fact different. the angles on the hood diagonals are different. same size different angles. the barrel from an MR9 appears, will fit a p99, but the reverse is not true without a little filing. i will be constructing a jig to achieve this angle and i will take pictures. i have included a photographic description with the green area being the same on both barrels and the difference of the MR9 angle shown in red. i will have to remove material from the P99 barrel for it to fit the MR9 slide properly.

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balance

· #16 · Nov 30, 2018

You can do whatever you wish with your barrel, but that is a pretty rare barrel in the US. I believe the only outfit that was importing factory reverse-threaded barrels for the P99 was Earl, and I'd assume that he didn't sell that many. Last I checked, he was selling them for a whole lot more than $63 shipped.

Something else to keep in mind, is that once that section of the barrel is cut, you will almost certainly have corrosion issues in that section until some type of coating is applied. That is a carbon steel barrel.

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djmg412

Discussion Starter · #17 · Dec 3, 2018

Balance - point taken and dually noted... I believe I will revert back to my original plan for this barrel which was, buy an actual p99.

I value everyone's opinions, and thank you for your input!

However, I think I may have found an inexpensive work-around to achieve a threaded barrel for my MR9...
Any thoughts?
https://www.centuryarms.com/canik-9mm-threaded-barrel.html

Corrosion won't be an issue for me... 😉Buffer/polish/mirror-finish/cerakote clear

balance

· #18 · Dec 19, 2018

However, I think I may have found an inexpensive work-around to achieve a threaded barrel for my MR9...
Any thoughts?

I don't know if there are dimensional differences between the Canik and Walther barrels, but I assume that there would be, not just in the chamber area, but the diameter of the barrel itself, as well as the cam that slides into the locking block.

I'd also be hesitant to cut any metal away from the chamber area of the barrel. It may need a certain amount of metal there for structural rigidity when 35,000 pounds of pressure is pressing against it.

I don't know if that would be a good idea. How much more does it cost just to get a threaded barrel that was specifically designed for that pistol?

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djmg412

Discussion Starter · #19 · Dec 20, 2018

Balance, I don't think they ever made any... I've looked and haven't been able to find one.

iam911x2

· #20 · May 10, 2020

I am curious if you ever made this happen ? I have a PPQ threaded barrel that I would like to put into a MR9 . As I read the thread, and looked at the differences, machining off the angle should not affect barrel integrity with the amount of material in that area.

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