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Old 11-02-2007, 08:05 PM   #1
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New Interarms PPK jamming

Bought a used - probably Unfired PPK. The Stainless steel Interarms model, Understand it was cast by Ruger and assembled in Alabama. under License from Walther. A few details on the Automatic pistol board under What pocket Automatic. It has several problems.



It jams when racking the slide to pull the first round off the magazine, almost every time. I can put this 80% to handling methods. The pistol does not have a manual slide stop so you pull back and let it go when chambering the first round. Since the slide is small it's easy to short stroke it and not pick up a cartridge. They don't chamber real easy even when you full stroke the action I give this the other 20% of the problem



During a string out of the magazine it will jam sometimes. I shot a box of no name ball and had about 5 jams out of 50. I wanted to mark up the slide and throat to see what was going on so let her jam all she wanted.



When clearing a loaded chamber the unfired cartridge will not always eject. Extractor is not catching the rim properly. No problem when shooting as the cartridge is blown back anyway, Only on ejecting unfired is there a problem.



Cylinder and Slide will work on these pistols and a number of photos of the Interarms SS pistol on there web site. it must be reparable if they will work on it. I am guessing it has potential.



I ruled out magazines and springs right off. It's new and everything looks OK. May change my mind later but for now not suspecting either. Used no name ball ammo, probably not the best but the bullet shape ought to feed. Will switch to Winchester or another American name brand once I have worked on it some.



Not a speck of lube on anything. I lubed it up with some light grease on the slide rails and another bit on the safety/decocker pin. Slight bit on the muzzle were it slides on the barrel too.



Every edge on the pistol is sharp right from the casting without any hand finishing. Inside it has sharp edges were the frames feed rails and ramp feed into the barrel. I actually scraped my finger on the sharp edge of the ejection port when racking the slide.



Took out the Dremmel tool. These things can cause a lot of damage if you are not careful. I like aggressive grit the right size felt disk and high speed with a light touch. Not overdoing it. It's amazing how little it takes to polish something.



The barrel to feed ramp junction polished and smoothed right up. So did the sides of the feed ramp. Just for good measure I broke the sharp edge on the ejection port. Using dummy rounds in my shop it fed a whole lot easier from the magazine. Loaded and stripped off a round 50 times with no problems.



Another good test is to put a loaded magazine into the pistol with the slide removed and push a round out up the ramp and into the chamber with your thumb. Ejecting it with a pencil. It is smoother now much smoother.



While I was inside polished up the safety/decocker roll pin. it was rough as a cob with no lube on it at all. Ran out of time but need to look at the extractor and see whats going on with it. Could need polishing or could be just lube. It needs to work good, you do have to clear a loaded pistol often.



Going to field test it next week. Will see



Boats





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Old 11-02-2007, 08:31 PM   #2
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New Interarms PPK jamming

My 380 walther[interarms] was very sensitive to recoil spring.I tried clipping the stock spring to no avail. Finally ordered different weights from wolff and the next weight down 16# and it ran perfect.You don't want to run too light a spring and run the risk of snapping off the safety lever.Another choice is to get rid of the loaded chamber indicater because it can cause a jam if the slide momentarily stops on closing then the round catches on the protruding pin. Good luck,those walthers can be pesky. Bill
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Old 11-03-2007, 07:06 AM   #3
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New Interarms PPK jamming

Bill they are two good tips.



Had not thought about the chamber indicator. The extractor is sort of balky and could be the indicator is too. Am working on it this morning. It seems everything needs a little hand fitting.



Springs could well be the problem, problem is I can't get them right now, If the other things don't work will surely go to Wolf.



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Old 11-03-2007, 12:54 PM   #4
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New Interarms PPK jamming

As a general rule, the shorter the barrel, the less reliable the gun. My 380 drove me up the wall with 3 mags perfect, then a jam. I've had pp's in 22,32, and 380 and all worked excellent.They were w.german tho. A lot of 380 style like this will run without the extractor even in the gun| If your mags are stainless, try to resist adjusting as i ruined 2 of them, you can't bend s/s walther mags. Good luck. It'll be a good project. Bill
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Old 11-05-2007, 08:07 PM   #5
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New Interarms PPK jamming

Thought I had it fixed but,



I modified my loading routine. Every time I loaded I pulled the slide open on the magazine empty. It locks open and holds. Then took the mag out put one round it re-inserted into the pistol and let the slide go chambering the round. Then de-cocked, pulled the magazine and filled it with a full load. The pistols stroke is so short and slide so small it's easy to short stroke it, this method prevented it. All the way open to slammed shut.



It went through 30 rounds of Winchester 95 gr ball without a hiccup. Then switched to Winchester 95 gr soft points. 20 rounds no problem then a 3rd shot jam.



On the jam, The cartridge was lined up nice and halfway into the chamber but the slide did not return fully to battery. I pulled the magazine and cleared the jamb. Then re loaded using the above single cartridge method which chambered a round fine. Then it jammed on the 2nd shot same way, not fully pushed into the chamber. This time I hit the slide with the heel of my hand and it went to battery fine. Fired the round and the next one jammed.



Field stripped the pistol to have a look. Obviously the spring did not have enough power to fully chamber a round when the pistol was dirty. Stripping the first one in worked fine and jamming it home with my hand worked good too. It was not real dirty starting from perfectly clean and 50 rounds through. Looking at the dissembled pistol it dawned on me the recoil spring rides on the outside of the barrel, It does not have a guide rod. I had lubed the pistol sparingly frame rails and decocking mechanism only. Not the outside of the barrell. Lots of friction on the spring from the barrell itself.



I cleaned everything up with a wet patch including the outside of the barrel. Put it back together and fired 30 more rounds without a problem. I suspect the recoil spring is either a bad fit or marginal in strength. This amplified by lack of lubrication.



I am ordering a new spring set from Wolf tomorrow.



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Old 11-06-2007, 01:37 PM   #6
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New Interarms PPK jamming

Keep working it Boats! Most have forgotten that lubrication used to be mandatory. A result of maintenance free guns.
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Old 11-06-2007, 04:24 PM   #7
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New Interarms PPK jamming

Oberstlt



This little pistol was completely dry when I bought it. I always lube sparingly but everyplace the gun needs it. Never thought about lubing the main spring since my Auto pistol experience has been with 1911's and the spring needs corrosion lube, not operating lube.



For sure the little PPK needs the main spring lubed. Could be thats why it jammed to start and polishing had no effect. Looks good though. The new crop of pistols needs cleaning with 409 and a spray of Armor all to finish



Still it could use some more spring tension, or so I think



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Old 11-06-2007, 08:24 PM   #8
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New Interarms PPK jamming

Like I said, those little walthers can drive you nuts.Yours is doing the same thing mine was.Believe it or not, it needs a weaker recoil spring. Also polish the slide bolt face and i use white lithium grease on the rails also premium ammo.When it pops your right hand,you've got it right for a walther. The most reliable ones that I ever had were pp's. Good luck, Bill
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Old 11-07-2007, 12:11 AM   #9
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New Interarms PPK jamming

Stainless guns need better lubes than carbon steel, as stainless tends to gall with marginal lubrication. If the gun is rough inside, I'd go with a high grade grease at least til it wears in.



Ball promo loads are pretty nasty. A 9mm might function fine whilst crudded up but a .380 blowback needs to be cleaner IMO.



My Colt 380 works fine for a mag or three with clean ammo; _maybe_ one with promo loads. Only have one mag anyways so getting through two reliably is a nice safety factor.





Regards,



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Old 11-07-2007, 06:55 AM   #10
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New Interarms PPK jamming

Bill



I wish I had read your post before ordering new springs. Ordered out a standard 20 # and a heavy 24 lb from Wolf last night. But they are cheap enough so can get more later. I wondered why there spring test pack had all lighter springs 17 down. It seems to me I need more spring power to return to battery when the pistol is dirty. Of course too much spring will cause smokestack jams like a 1911, I guess.



Agree comments on stainless needing different lube. I have never used synthetics There may be a place for it on this little pistol. I used a touch of White Lithium grease on the slide rails and light Balistol oil on the mainspring/barrel. Anyway clean and with a well lubed barrel and recoil spring am going to run another box through before installing the new spring.



Am going to stick with Winchester ball just to keep a consistent test.



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