keeping mags loaded

[RSR]

I'd bug ETS about it too - they seem much more agile as far as developing new things goes. Plus, they make clear mags already too.

This, but who is currently making CZ-USA mags?  Saw somewhere that current CZ-USA EVO mags are all US made, so if so, who is making them and why the issues?  That it might be ETS gives me pause.

[RSR]

Wraith223 is correct that sunlight is the enemy of all plastics. Thats why most polymer manufacturers use carbon black additive in the plastics. Carbon black acts as a sunscreen and helps keep the plastic from getting "Dry out Burn out embrittlement". The new Magpul plastic that is the sand color stuff,  thats some tuff !@## man I tell you. GOOD tough and dense but heavy for what it is. Its a cured product from what I understand not a thermo melt.  The clear plastic stuff even the smoke plastic stuff will melt, deform, and even dissolve when brought in contact with kerosene and other kerosene based products.

Now for all the talk of Magpul making the mags for the scorpion I don't think they will do that. The mags seem decent enough just need a little tweaking with new plastic and maybe some carbon black in the mix.  Just making the mag out of black plastic that is more dense will help things and then a little witness hole for the 30th round indicating full mag. Make the follower red to help with the witness hole when getting close to the 30th round. Yes just like the Magpul Glock Mags. Besides and you must remember mags are considered a consumable item. Magazines in the military channels are considered expendable consumable like ammo. Once used they are considered to be disposed of dropped not used again.
What would be the best and probably the quickest would be Scorpion replacement grip and some safety levers. Thats a whole hell of a lot easier design and manufacturing wise to bring to market. Magpul MOE SL grip with some nice wide safety levers would be the FUNK.

As for Lancer IIRC and I can't remember where I read it at but someone said that they are contract bound to not make mags for 9mm smg's for any other companies. Besides when paying $20 for a factory mag who is going to buy a $50.00 mag when a $20 mag is available.

Yes, opaque mags are typically more durable than clear.

And agree on the price difference for lancers, at more than 2x, they're a novelty not a necessity.  And first I've heard on smg exclusivity but that wouldn't surprise. 

[majulook]

I wish you could buy the poly mag case separately, like you can the mag base plates and feed assembly.

[armoredman]

CZ EVO magazines are still being made in the Czech Republic. 922 compliant parts are being made here in the US, not sure who is making the mag parts here. The mold change was very recent, and BTW, CZ-=USA liked the Type A/Type B comments, they thought that was cool. The polymer has NOT changed, just the minor mold tweak. Things may change again in the future, but my contacts aren't saying anything yet.
If CZ-UB would license someone to make mags here it might be a very interesting thing...

[mursalot]

I have 2 of "b" type mags which were manufactured jan 16 and shipped with my carbine (1 of which has a hairline crack in one of the feed lips).

I have 12 of the "a" type mags which were all manufactured in 2015 (various months) and 5 of those have hairline cracks.

These hairline cracks are 1/2 - 1 cm in length and seem to be inside the plastic (not tactile).  I was surprised that of the 2 b mags, 1 has this crack that looks similar to the A mags.

So, to me, this new mold design isn't the fix we're looking for.  I keep all of these mags loaded, but shoot about every other day and the mags are rotated front to back after use.  The mags still function perfectly so I have no intention of sending them back until they stop holding rounds or feeding properly. 

I remember when all of those bans were in effect (assault weapons ban, brady bill, etc...), you could still get mag replacement bodies from manufacturers for standard cap mags, you just couldn't get the other hardware to support a double stack mag.

[Valk]

Where is the crack on your Type B feed lip, if you don't mind me asking? I've noticed "lines' on some of my magazine feed lips, but given that none of them have been shot yet (haven't had time), and only one has been loaded, I'm wondering if it's less a crack and more just a noticeable mold line since those that have the marks are all in the same place.

Also, you mentioned the Type Bs are the ones that came with the carbine, so I'm assuming they're 20 round magazines. If possible, could you get a measurement of the spring length? As I've mentioned elsewhere, I'm wondering if the mold revision is only the most immediately noticeable of multiple potential changes to the magazine design. If so, they could still be using 30 round springs in 20 round mags, which is causing pressure that the improved feed lip design is not enough to offset on its own.

[mursalot]

Where is the crack on your Type B feed lip, if you don't mind me asking? I've noticed "lines' on some of my magazine feed lips, but given that none of them have been shot yet (haven't had time), and only one has been loaded, I'm wondering if it's less a crack and more just a noticeable mold line since those that have the marks are all in the same place.

Also, you mentioned the Type Bs are the ones that came with the carbine, so I'm assuming they're 20 round magazines. If possible, could you get a measurement of the spring length? As I've mentioned elsewhere, I'm wondering if the mold revision is only the most immediately noticeable of multiple potential changes to the magazine design. If so, they could still be using 30 round springs in 20 round mags, which is causing pressure that the improved feed lip design is not enough to offset on its own.

The hairline crack on the B mag is on the right feedlip, 1/16" from the front of the feedlip and 1/8" long running along the curved portion of the feedlip (left to right, right to left).

it may be a sign of premature failure or it may be nothing.  the reason i'm not too worried about it and will use all my mags without bias until they eventually fail (if that day ever comes).

yes, these are all 20 round mags.  i can't give you a spring length because they all vary by how long they've been in rotation.  i mean, i didn't start with 14 mags, just slowly picked up a couple every so often (just got 2 more in mail today, type A) and added them to the rotation.  i can give you a coil count though, 18 tip to tip. same springs in A and B mags, only difference is the mag body, follower and baseplate.  how many coils are on the 30 round mags?  how many are on the 10 round mags?  if i have both of those numbers, i may just split the difference and cut half way between the 2.

now i can understand the crack on the right feed lip since that's where the last round rests.  what i don't understand is why half of my crack mags (hairline crack, just a reminder) have this on the left feed lip.  and they are cracks because if you look directly it, invisible, but as you rotate the mag, you can see the light travel through line.  maybe i could feel it from the inside, but the outside is smooth.  really don't feel like dumping all my rounds, gutting the mag, cleaning it and trying to squeeze my pinky in there at an odd angle to feel for something (that just sounds so wrong).  guess i could use a dental pick to feel in there.

ahh, i'm just going to make a youtube video

[mursalot]

Where is the crack on your Type B feed lip, if you don't mind me asking? I've noticed "lines' on some of my magazine feed lips, but given that none of them have been shot yet (haven't had time), and only one has been loaded, I'm wondering if it's less a crack and more just a noticeable mold line since those that have the marks are all in the same place.

look at post #22. looks like the first pic

http://www.czfirearms.us/index.php?topic=82990.0

and the video that started the whole A vs B mags

http://www.czfirearms.us/index.php?topic=80841.0

[Valk]

I checked my 20 rounders and found both had 18 coils. Both are CZ USA-made, May 2016, Type B. My 30 rounders (also May '16, Type B) also have 18 coils - seems that hasn't been changed yet.

As mentioned, some of my magazines have "lines" in them on the left feed lip despite being fresh out of the package (the loaded mag in this photo is the only one that I've loaded up at all so far). With some, it's more noticeable than others, but it's a consistent shape and placement on each. I'm thinking this is just a flash line of some sort. However, I also think it may be a point of structural weakness that is exacerbated when used in conjunction with 20 rounders (too much spring pressure) or Type A 30 rounders (thinner material). I'm curious to see if anyone here has a Type B 30 rounder that wound up with cracking in the same spot.

[mursalot]

Thank you for the pic. Yeah, it doesn't help that these lines are located at the thinnest portion of the feed lip. Is cz sending the US all of their reject mags and sending all of the goods ones to the military/LE community. Just a theory. Since your mags already had these lines when they arrived

Soooooo....does anybody out there have a 10 round mag?? How many coils inside? Would be nice to hear from more than 1 source for confirmation.

[Valk]

Thank you for the pic. Yeah, it doesn't help that these lines are located at the thinnest portion of the feed lip. Is cz sending the US all of their reject mags and sending all of the goods ones to the military/LE community. Just a theory. Since your mags already had these lines when they arrived

As worrying as that thought is, I still think (well, hope) my hypothesis about those lines being mold lines is what's actually going on here. If CZ was just dumping reject mag bodies onto the market, our "broken mag" thread would be much, much longer, I presume.

[rotorblade]

Thank you for the pic. Yeah, it doesn't help that these lines are located at the thinnest portion of the feed lip. Is cz sending the US all of their reject mags and sending all of the goods ones to the military/LE community. Just a theory. Since your mags already had these lines when they arrived

Soooooo....does anybody out there have a 10 round mag?? How many coils inside? Would be nice to hear from more than 1 source for confirmation.

Wait One!!!!!

OK left is 10 rounder with its spring. Middle 20 rounder with its spring. Right is 30 rounder with its spring. Just as they are taken out of the mag. ALL 3 of these mags have sat for probably 5 or 6 months. I use the 10 rounder for zeroing and stuff at the outdoor range. I use the 20 rounder for zeroing at the indoor range. I only have 1 10 rounder and 1 20 rounder. The other 20 round mags that came with my Scorpions I sold with all the parts I took out of the gun to make it 922r ready.








Oh and picture of the wife shooting the MRO Sighted Scorpion which she has declared hers. YES she is on the trust. OH and yes she wants me to find someone to hydrodip it to match the muddy girl hearing protectors.        Although she is wondering if she has it done then she will hate it later. I was thinking of doing the Handguards, both sides of the receiver, the places of the stock that aren't rubber, the pistol grip and leave everthing else alone. Definitely have the lacquer clear coat applied after.

[akuser47]

Awesome I hope to someday find that special someone that will enjoy guns and fishing, and camp fires like I do your a lucky man.

[mursalot]

Thank you for the pic. Yeah, it doesn't help that these lines are located at the thinnest portion of the feed lip. Is cz sending the US all of their reject mags and sending all of the goods ones to the military/LE community. Just a theory. Since your mags already had these lines when they arrived

Soooooo....does anybody out there have a 10 round mag?? How many coils inside? Would be nice to hear from more than 1 source for confirmation.

Wait One!!!!!

OK left is 10 rounder with its spring. Middle 20 rounder with its spring. Right is 30 rounder with its spring. Just as they are taken out of the mag. ALL 3 of these mags have sat for probably 5 or 6 months. I use the 10 rounder for zeroing and stuff at the outdoor range. I use the 20 rounder for zeroing at the indoor range. I only have 1 10 rounder and 1 20 rounder. The other 20 round mags that came with my Scorpions I sold with all the parts I took out of the gun to make it 922r ready.

THANK YOU!!!

[mursalot]

so...

11 links (let's just say 12 to keep things even) on the 10 round mag
18 links for the 20 and 30 round mags
half way between would be 15 links
i'm cutting 3 off

bleep, should've just listened to John-A from the beginning!

why isn't cz cutting these down? i've heard of people with 30 mags having difficulty getting the last round or 2 in