457 10 round magazine jamming

[Understanding432]

I got a metal 10rnd magazine for 457. The CCI SV rounds are jamming almost every other time. It appears that the lead nose is digging into the metal wall in front and cannot rise to the top of the magazine for the bolt to capture. Other rounds seem to be working fine tho.
No issues with the 5rnd magazine that came with the 457, even with CCI SV. Would it be advisable at all to use a screw driver and push the metal that the lead nose is digging on, a little but to make the movement of the round less resisted?

Secondly, the 10rnd metal magazine has 2 holes on the side, I am guessing to check how many rounds are in the magazine. The bottom hole is smaller than the one above it. Is that normal?

Thank you

[alp3367]

 Are you sure it's a 457 (or 45X series) magazine. The only 10rd rimfire magazine for those I've been aware of for years is polymer and not metal. 5rd come in poly and metal but the 10rd has only been poly for years.

[Fasteddie01]

I've read in many forums that the 10-round mags often need the spring 'reversed' so the 'finger' is pointing the 'other way'.  This causes the feed angle to be changed.  Be careful to NOTE which way it points when you take it apart.

[Understanding432]

Are you sure it's a 457 (or 45X series) magazine. The only 10rd rimfire magazine for those I've been aware of for years is polymer and not metal. 5rd come in poly and metal but the 10rd has only been poly for years.

Yes, that packaing said 455/457 and another 45x on it.

I've read in many forums that the 10-round mags often need the spring 'reversed' so the 'finger' is pointing the 'other way'.  This causes the feed angle to be changed.  Be careful to NOTE which way it points when you take it apart.

I will look into disassemblying the magazine. It does however, feed other rounds fine.

Thank you

[Fasteddie01]

If you open it up, there may be debris inside or burrs causing the follower to 'drag' a bit.  Or the tip of the bullet catching on something.

[jstanfield103]

I just gotten a 10 round steel magazine. It jams terribly and I've take it apart several times and made sure everything is correct. I used CCI SV, Aguila Super Extra, and even tried some Thunderbolts. Jammed on everything. I took it apart so many times that I finally shot the locking pin out from the base plate. It is back at CZ right now waiting for a replacement. See how long that takes. Also forgot to mention that the thing is extremely hard to insert with the bolt closed and not easily catching when the bolt is open. Something not right with it. I bought the steel magazine but if they are that bad I would just as soon them send me a polymer magazine.

[Bob Wilkins]

I, also, will offer that steel factory 10rd magazines have been unobtainium since before the 457 ever came out. Packaging listing 457 says to me that it is not from CZ, but instead some aftermarket magazine, and aftermarket is muchly a crapshoot. I could be wrong, but surely would own genuine CZ steel 10rd magazines had I ever seen any for.sale from CZ-USA or any legit vendors of their parts.

Holes in magazines can serve a multitude of purposes, ranging from tooling holes for holding fixtures during forming/assembly, to ability to count remaining rounds, to that of aiding disassembly by follower/spring compression and pin placed through holes/spring for spring retention and then follower dumped out, spring recompressed and pin removed with pressure then relaxed on spring.

[Boilerjack22]

The steel 10 rounds mags that came with my CZs and those I bought later, function perfectly

[Fasteddie01]

OP - Have you solved your prob ?  It's good to 'finish' a thread with a resolution, even if it's "I gave up and s-canned it ! "
I have One metal 10x mag - all others are plastic, both 5s and 10s.  All, including the metal, work fine.  I  DID however, 'widen' the mag-well and Bottom-plate by filing it a bit.  And have an extended mag release.

[Bob Wilkins]

If he did not get aftermarket, I rather wonder if he bought a .22wmr magazine, and removed filler (hey, have seen folk do amazing things to "make magazines work" and all manner of other "upgrades") . This is what turns out to be an older thread which.I should have ignored, plus a lot of confusion in replies bringing in 10rd poly and 5rd steel, the OP talking 10rd steel. which new supply.seems lacking for quite some time. If CZ spec. for certain models includes a 10rd steel, can certainly.see them holding reserves for those guns and not selling them,  whether still in production or not, especially if profit margins higher on poly.

Boilerjack, I am no longer playing over at rfc, and will hopefully/finally have some important news for ZKM611 owners regarding 611 ringmounts of low/med/high and of proper fit and identical to those medium sets as supplied by Denny, rather than folk using exceedingly poorly/insecurely/offcenter fitting latter 527 ringmounts. Same set also would be correct.for early BRNO Model 1 and 527. When.this deal finally goes through (I am the experimental subject), I will seek to PM you via this forum so that you can help spread the word, if you would be so kind.

[Bob Wilkins]

The steel 10 rounds mags that came with my CZs and those I bought later, function perfectly

Meant to hit quote for above comment so that hopefully boilerjack would read it if he gets notifications...since what appears a stale thread, am hoping nobody feels this an abuse of thread, as I have quite a few more posts to make in order to PM him, and apparently visa versa.

Still hope the two posters with problem mags chime in with further details, including from whence they obtained CZ OEM 10RD .22LR steel mags, as I want a few myself if they are actually.out there somewhere.

[jstanfield103]

I sent my steel CZ made 10 round magazine back to CZ and they sent me a polymer 10 round magazine when they got one in. The Polymer works perfectly. I would love to have a steel 10 round magazine but will never purchase another one. My two polymer 10 rounders work to good.

[Slikshot22]

thats unfortunate... I only have the polymer type and they work great

[Bob Wilkins]

I sent my steel CZ made 10 round magazine back to CZ and they sent me a polymer 10 round magazine when they got one in. The Polymer works perfectly. I would love to have a steel 10 round magazine but will never purchase another one. My two polymer 10 rounders work to good.

I had really hoped to hear the magazine was aftermarket, as although my 10rd poly are perfectly functional, I prefer old fashioned steel guns and magazines, steel feed lips do not wear out as does plastic, and supply of plastic or steel is never certain in the future. Already replaced the crack-prone poly magwell with aluminum, and plastic mag catch with steel. At least I have steel 5rd in reserve, and those function.

Am suprised on the problem from CZ as they claim 100% of their gun parts made in their circa 200 acre factory complex, but, always the possibility of magazines not considered gun parts and new sub-contractor not up to snuff.

[Dobegrant]

I have 3 457’s, my varmint MTR came with a 5 rd metal mag, my 457 trainer also came with metal 5 rd, but the Jaguar that I bought in May came with a 10 round metal mag and I also have 10 round plastic 10 round mags that all work well.