One minor feed problem with the P-07 and extended mag bases

[Joe L]

I don't have a lot of rounds through my P-07, maybe close to 1k.  I like the long grip feel provided by the extended base pads so I put those on both P-07 magazines last week before the last practice and bullseye match.  On Friday before the match I had one jam, where the round made it half way in to the chamber and the slide made it half way to battery.  Then it happened twice during the match, one time resulting in me taking an alibi and it cost me an x-count. 

I checked the extractor tension and the breech face and compared it to the P-09's which have never had the problem, all felt good and smooth as I pushed and empty casing up in to the breech face.  No burrs or sharp edges. 

Next I checked the magazine spring tension.  With the extended base pads it was less than with the standard base pads, and less than on the P-09 magazines, at least in my unscientific "feel" test.  So, I put the standard base pads on the magazines and will try them.  If the problem goes away, I think the magazine spring just didn't have quite enough tension to push the extractor back to let the round slide up behind the extractor.  I may remove the extractor and polish it up a little also, but I'll only make one change at a time so I can identify exactly what the cause was. 

The round is definitely hanging up getting by the extractor.  I gotta either smooth the extractor, reduce the extractor spring tension, or increase the magazine spring pressure to keep it from happening.  Since it started after I put on the extended base pads, that is the first thing I am going to change back.  This has nothing to do with bullet shape, interference with a slide stop, or anything like that.  The round is already headed in to the chamber when it stops the slide due to the angle because the rear of the round can't get under the extractor.

Joe 

[Earl Keese]

Are these the plastic ones from CZ USA? I have them on my 07 mags and 2 of 4 09 mags. No problems so far with the ammo I use. I like them on the 07 especially as my pinky hangs off with the standard base. Interested to see your results.

[Joe L]

Earl, thanks, good to know.  If no one but me is having any problems when the extended pads are in use, I have a burr or rough spot on the breech face or extractor.  That is what I need to know, and that is what I am expecting to hear.  Otherwise, there would have been reports here, I think. 

Joe

[Winkel]

Joe,

Just a thought but I usually disassemble and clean my mags when new.  I then spray the insides with some DuPont dry lube with Teflon.

Also, you might try 'stretching' the springs a little before you reassemble the mags.

I hate to presume that I would tell you something you didn't already know, but it might be worth a try.
Winkel

[Joe L]

Winkel, thanks, good suggestions.  I haven't cleaned the mags at all. 

I shot a few rounds through the gun tonight (at a 100 yards) without issue, with the standard base plates.  But I didn't shoot enough rounds to qualify as a good test. 

Joe

[Earl Keese]

All of my mags have been disassembled, cleaned and dry lubed. For what it's worth, the only mags that seemed to need it came with my Kadet. The 07/09 mags were clean.

[Colorado Shooter]

We're these mag bases the +2 capacity ones? Sounds like a the spring lacks the tension needed to force the base of the case against the feed lips to slide under the extractor. Maybe try a spring from a P09 magazine I it. I don't own a P 09, but if I did, I'd try the spring change first.

[M1A4ME]

I just use P09 magazines to increase capacity.  Not as "pretty" as the extended bases, but it works.

I carry the P07 with a P07 magazine in it, but the back ups are P09's.

I thought about trying to make a sleeve but that would then make the mags. not fit the P09 without first removing the sleeve.

[Joe L]

Thanks for the replies. 

I am going to take the extractor out when I change the sights and clean up the breech face and the extractor edges slightly and then try the two clean magazines again with and without the extension.  I bet it doesn't happen again.  If it does, I'll put some stronger magazine springs in. 

Joe

[jameslovesjammie]

My money is on the magazine springs.

While they work fine with the standard basepad, changing to the etended basepad gives them almost an inch of extra travel.  I think if you were to swap in a +10 or +15 spring, you wouldn't see it again.

I went through the same thing when I first got CZCustom extended basepads for my 75B .40 for USPSA. 

[Joe L]

I have some +10 springs here that were too much for a 75B.  I'll try them if I need them.

Thanks, gentlemen.

Joe