9MM Rounds Wedging Inside Magazine

[IDescribe]

Yes, there are magazines that are reliable, most of them as a matter fact ? I have checked each attribute against the other that I thought could cause the mag feed issue. 

Have you checked to see if you have reassembled all the magazines with the springs oriented the same?  That's actually why I asked if you had disassembled the mags.  I have never taken apart any of my CZ mags (shame on me), so I don't even know if it's possible to screw this up with CZ, but I know that with some guns' mags it is possible to put the spring in backwards and cause problems.  If it's possible to screw that up, you should check it out.   

[GregT]

1SOW --- Thanks again!

IDescribe ---  Good thought on the mag spring, but it is nearly impossible to assemble the mags backwards.  The design is such that they are somewhat polarized, making bad assembly almost impossible, unless a hammer is handy.  :-)

Guess what?  It happened again, right out of the chute!  Fired 5 rounds, then mag went into vapor lock!  My take on it ? the jam cost me yet another stage of fire.  The sand seen in the mag is after hitting the ground, other wise, mag was super clean as usual.  I preserved as much of the failure as possible, including the sand.



Got home and cleaned the mag thoroughly, measured and decided to squeeze the mag by .010 right at the point of jammed rounds.  It now measures .855 wide instead of .866.  I do have some vise jaw dents in the mag ? which look awful, but if it works, fine.  Ready for the next match on Thursday.

Spring comparison:  Image is of three mag springs.  The one in the center is the set-up that came out of the failing mag.  It does have a curved set to it, strange, but somewhat expected.

Spring set-up on the bottom is new, not yet installed in a mag.  Center and bottom set-ups are from the CZ Custom Shop.  I have one magazine that another of the CZ Custom Shop springs in it and it works fine, not 100 percent but I'm not afraid to use it.

The top mag spring set-up is standard CZ factory set-up as received.  I have it in the big stick mag now, along with the ?squeeze? job.  BTW, wouldn't ya know it, the failing 26 rounder mag number is ?13!?



All for now.

[1SOW]

The back skirt on the stock follower prevents it from tipping up and down--should be reliable-1 rd.
I don't know if the 20 rd mag spring bends will fit that follower  but have you tried using that follower in the mag that screws up?   

[GregT]

Currently doing exactly that.

[GregT]

Okay... Here's ?End Game?.

All mag issues have now been resolved!  I should mention that I did wreck two 26 round mag bodies by trying to ?squeeze? and reshape the mag tubes in an effort to make the big stick mags feed and function.  All efforts where feudal and costly.

My thoughts where that someone, some where, has had these same problems and knew what the precise solution was.  Being an engineer, I need to work with numbers.  That is not to say the help mentioned here was wrong ? it's simply knowing precisely where to squeeze the mag bodies and by how many thousandths of an inch to displace the tubes, and at what X-Y coordinate.

An answer was found with Bevin Grams and his company, Grams Engineering.  I placed a call a few weeks ago and was surprised in as much as Bevin himself answered the phone ? I was fully expecting an answering service or having to leave a message, and then waiting for a few days for a reply.  I was pleasantly surprised and was able to describe exactly what was happening with my 26 rounders.  Bevin understood every word in my failure description, and without hesitation described what had to happen to affect a fix.  I promptly sent off two brand new complete 26 round Czechmate tubes for rework.

In a matter of days he had them back in my hands!  They now hold 29 rounds each!!!  To me, an unheard of load-out.  The reworked mags are flawless and haven't failed in two matches.  Here's the almost unbelievable aspect of the mags, they feed all 29 rounds with one in the tube!  A total of 30 rounds in the gun!  Finally competitive with an STI and the like ? with no failures to feed!  I may lose a stage, but it sure as heck won't be from magazine issues. (I'm not that good a shot anyway.)

Today I sent off two more 26 round magazines for Bevin's rework process.  It should be mentioned that the standard CZ sole plate has also been replaced with CZ Customs extended base pad, PN 10182 ? this, along with Bevin Grams rework gives the 29 reliable rounds.

Having said this, rather than trying to resolve these issues in a DIY manner, save the grief and get your mags off to Bevin Grams.

I would like to thank each of you that took part in this discussion ? each had the right idea.

Greg T

Addendum: I should have and didn't mention this above!

Another important aspect of making these magazines function reliably (Forgot to mention earlier!  My bad.) Is Bevin Grams Follower Kit, PN FKCL-13.  It is imperative that this kit replace whatever is currently in any CZ 26 rounder that he receives for rework.  Did I mention, imperative....  It's part of the key in making the mag work with 29 rounds.

[Tok36]

Glad you found your fix. Thank you for coming back and filling us all in. May you shoot well.

[Stuart]

Bevin is voodoo on mags.
back in the day he did my STI/SV big stick and they were awesome.