New PM45 Range Test

[jeep45238]

I think that it would just push the cartridge forward enough to scoot behind like when the rim gives way with my "squeeze" -- the "crunch".

The only way to modify your gun to feed would be to grind in a rearward angle on the breech face, starting right below where a round would sit when in battery and extending rearward just enough to consistently clear the rim of the cartridge.

I may know a thing or two about mechanical interfaces - I optimize repair processes for jet engine parts, and have built some quick cars with little tolerance stackup throughout. My spelling and grammar are horrible though



Putting a bevel on the edge will do nothing except have the slide touch less of the rim on the cartridge face

[wyntrout]

I can't wait to see what the fix is -- a redesigned frame, moving the magazine well forward at the top.?
Wifey's home so I must get ready to entertain her. I just had my buddy over to help me get the new-in-January 58" Samsung plasma HDTV, top-rated by Consumer Reports... best HDTV rating of any TV -- off the damn wall and remount it to the stand so the repairman can get at it tomorrow. It really sucked unhooking about 9 or so electronic components, UPS's, cables, power cords... just lots of stuff and move the heavy cabinet holding all of that stuff. I just hope it can be fixed ASAP. I'm tired of using my little 22" LCD HDTV -- it just ain't the same.
Hmmm. My new TV blew up -- loud crack like a firecracker. My new PM45 is broken or defective... what else is going to happen?? I shouldn't have mocked Murphy the other day!
Wynn

[Bawanna]

I see the most important tool is at the forefront. The BFH. Thing looks fast just settin there don't it.

[gb6491]

...
As an emergency measure, I could very slightly round the bottom of the "stripper" but that might screw something else up. This isn't an emergency, though....

Actually, that's sort of what I did to fix the same problem (actually, I could not get my magazine to seat) with my CW45. I slightly changed the angle that the slide is beveled to where the rim of the round contacts it.
In the photo below, I stoned the bevel so that the tailing edge of it is moved further rearward (red arrow). I did not change the starting point of the bevel (green line).

The round in the magazine now cams/rocks forward into place, ready to be stripped out of the magazine. In the photo below, the shot on the left was taken just as the round contacts the slide; on the right, shows the magazine seated:

A quick movie of the action:
YouTube - slidemod.MPG
Regards,
Greg

[Bawanna]

That looks like a good fix. Your's obviously is showing no gap at the rear just like Mr. Wyn mentioned. Seems like if it was mine, I'd want Kahr to do what you did unless I picked up a used one with issues. Kahr should have caught that easy.

[a.squibload]

Wyntrout, I can solve your problem. Borrow one of those feminine pads, peel off the
backing and stick it on your forehead, it will absorb impact from the cases and prevent
injury. As far as your feed problem, I have no idea. Hope this helps... :>)

[a.squibload]

Sorry about that, can't help myself.

In your video, after the magazine seats it looks like the case rim is tight against
the breech face (proper term?). Will the slide move any farther back from lock?
SWAG that the slide lock might be at fault? Bevel looks like a good fix.

Wondering if your slide's rearward travel is restricted somehow, don't know enough about it,
is there a buffer? Couldn't be dirt on a brand new piece, maybe a burr? You've had it
apart, probably would have seen that.

PM40 suggested technique is to lock slide, insert mag, release slide.
When new, mine wouldn't feed cycling by hand, only by releasing the slide lock.
Tried it again recently, now it works by hand.

[gb6491]

Sorry about that, can't help myself.

In your video, after the magazine seats it looks like the case rim is tight against
the breech face (proper term?). Will the slide move any farther back from lock?
SWAG that the slide lock might be at fault? Bevel looks like a good fix.

Wondering if your slide's rearward travel is restricted somehow, don't know enough about it,
is there a buffer? Couldn't be dirt on a brand new piece, maybe a burr? You've had it
apart, probably would have seen that.

PM40 suggested technique is to lock slide, insert mag, release slide.
When new, mine wouldn't feed cycling by hand, only by releasing the slide lock.
Tried it again recently, now it works by hand.

Once the magazine seats there is a little space between the round and the breech face:

The slide can be moved a little further back: enough to release the slide lock.
I have a another slide lock (a MIM piece), but there looks to be no difference in position when it is installed.
No buffer, there's nothing I've seen that looks like it's limiting the slide's travel. I did this tweak some time ago and have had not had the problem since (I'm up to about 750 rounds through it).
Regards,
Greg

[wyntrout]

Thanks for the inputs, guys. I'll email and/or call Kahr tomorrow. This looks like a design flaw. The slide is locked back and the magazine's top round doesn't clear the bottom of the stripper and unless you apply enough force to make part of the cartridge rim give way so that the cartridge is pushed forward enough and slides up the striker housing. There should be some kind of gap there. It's about 3/16" on the PM9 (eyeballed).
I tried making the underside of the ejector more like the PM9, thinking that it was pushing the rear of the top cartridge down. While doing that, I had an oopsie with my "Dremel-Like" tool and took a bit off the inner wall of the frame opposite that. I think it was the grinder bit and the polish "wheel" that touched the frame... oops! I did notice a burned plastic smell... odd.
I think that we just need to get the cartridge and ammunition manufacturers to bevel the base of the cartridge cases and things would be hunky dory.
Wynn

I emailed Kahr Technical Support
service@kahr.com and put "To the attention of Ian".
I'm waiting on Samsung repair today and now Kahr to contact me. 05:47/8 March.

[wyntrout]

Well, the TV is fixed and I'm waiting to hear from Kahr. My buddy's coming over shortly to help me hang the TV back up on the wall. Then I have a lot to do moving stuff back in place and hooking up everything again. I still have to put the rest of my gun cleaning kit and stuff away, too. Another busy day where I don't get everything done. At least I got the wash done yesterday... for a few days, anyhow.
Being a house-hubby can be a lot of work and when you have hobbies and yak online or shop most of the day, stuff can pile up... more than usual.
Dang, I have a week's worth of newspapers on the card table waiting my perusal... old news by now, there are the comics and Jumble. I've got to keep my mind active.
I still have some reporting and pictures to post, but I need to get on other stuff now. It's another bright and beautiful day here in Northeastern Florida ~ 63°. Later!
Wynn

[wyntrout]

Update on PM45

Well, I emailed Kahr Service around 530 am and the about half an hour ago and after I found the phone number, called them. I talked to Ian, who answered the phone, and he's sending FedEx to pick up the gun and the two included magazines tomorrow. It's nice to have more than one, and my main CCW has been the PM9.
Now I can go start hooking up my TV. It's up on the wall again, but it will take half a day to hook everything back up. I have nothing more pressing than a nap. Maybe a quick ammo report on the Speer 9mm 124-grain GD SBs +P.
Later.
Wynn

[jocko]

let us know what they do to your gun. Not sure if it is a design flaw or just a flaw in your particular gun.

[Vinikahr]

Please keep us posted, there is a particular member that has a heavy(emphasis) interest about this information.

[Bawanna]

oooom, hari krishna, ooooom , hari krishna, oooooom.

[Vinikahr]

oooom, hari krishna, ooooom , hari krishna, oooooom.

Thanks for the laugh, I have not laugh this hard in a long time!