New CZ712 gen 2: 12 ga not cycling

Heimer Schmidt

Heimer Schmidt

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Anyone have experience with the cz 712 gen 2 12 gauge semi auto? I’ve only had it out once. Went through about 30 rounds and not once did it successfully rechamber. I was using mostly Score buckshot 2 3/4, 1oz. Also some steel bird shot by SCORE (I think those were 3” and over an oz). Just to offer some more details - it ejected the Spent shell great and partially rechambered, but just would not fully close/stays out of battery. I also Tried 4 Winchester® Blind Side 12-Gauge Pheasant Shotshells (12 Gauge - 2-3/4" - 1-1/4 oz. - #5)…. Same problem. I read sometimes the gas ports for 12 gauge and .410s got mixed up at the factory!?

Ideas other than you get what you pay for?

Also would CZ in Canada fix this? Sounds like they are very helpful in the US.
Cheers
 
Not familar with the cz 712 . What you discribe sounds like a problem with the action return spring .does the action slam shut when the action release is pushed .
 
rembolt said:
Not familar with the cz 712 . What you discribe sounds like a problem with the action return spring .does the action slam shut when the action release is pushed .
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Thanks. But yes i think it does seem to- eg I get the first shot off, but it fails somewhere after ejecting the spent shell; the appears to chamber the next shell but it does not make it into battery.
 
Underpowered return spring, or the action is gummed up and sticky with dried up lube or preservatives. I'd strip it and give the action a good scrub then lube as per manufacturer's instructions, see how it works then.
 
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Heimer Schmidt said:
Thanks. But yes i think it does seem to- eg I get the first shot off, but it fails somewhere after ejecting the spent shell; the appears to chamber the next shell but it does not make it into battery.
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Look for possibly a burr or a sticky spot in the bolt travel . If the gun is failing to go into battery it is not likely a gas problem . How far does it eject the spent shell .at your feet or several feet away .
 
rembolt said:
Look for possibly a burr or a sticky spot in the bolt travel . If the gun is failing to go into battery it is not likely a gas problem . How far does it eject the spent shell .at your feet or several feet away .
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I think they were going far. I’m pretty sure the empty shells vanished quick. I was at the range with lots of shell litter and was also patterning a pump action so I couldn’t be sure by just looking around after. I’ll watch for that.
 
jethunter said:
Underpowered return spring, or the action is gummed up and sticky with dried up lube or preservatives. I'd strip it and give the action a good scrub then lube as per manufacturer's instructions, see how it works then.
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I like the sounds of this explanation- dried up lube; sticky action. I’ll try that. As for the spring - could be- it is new but who knows
 
Just a quick partial update- while I haven’t had a chance to run rounds through it again, I will say running the action manually it seems smooth and strong so that I’m seeing the burr or dried lubricant arguments as less likely explanations. It seems well oiled but I will break it down for a more complete cleaning and lubrication and try a box of target rounds with at least 1 1/8 oz loads. I can believe underpowered ammo… even though I ran a few solid Winchesters through it, it was only a few.
 
Well - Semi's can be sensitive to ammo. Not just load, but other parameters such as shell length (even 2 3/4 in shells are different lengths) base material, etc. And yes, a lot of semi's require a break-in period of a couple of boxes of heavy loads. Given the price of shells these days, you can mimmick this by cycling the action manually. Even then, some brands of semi were never designed to handle light target loads (eg 1 oz, 2 3/4 dram) and will not do so reliably.
Finally, Winchester seems to be winning the race to the bottom as far as shell quality is concerned. In particular, their promo loads tend to stick in the chamber. For a semi, this can mean robbing cycling energy. Food for thought...
 
Ive owned a few of these and they are built by HUGLU for CZ and are considered in the US to be a very good gun, lots of info on huglu and CZ forums on them. They do require a fairly heavy shell for break in, approx 30-40 rounds. Once they start to run in, they never quit.They did replace the gun with a new G3 model early this year which is a completely different gun, still gas operated but very different internals, it doesnt require much break in at all, I own one a CZ712 G3 in walnut and a huglu variety as well as the CZ, both guns are identical.If you run snap caps through it manually does it work fine?
 
Thanks @hunterhenderson and @cosmic… I did find a forum post that said apparently according to CZ- one needs loads of 1 1/8 oz at 1275 FPS minimum; more than the typical target or tactical load- so I’ve got 9 different boxes of ammo on the way to try out come September- all harder hitting ammo… funny enough all my tactical and target loads are too light… it’s like Turkey and duck are harder to bring down than intruders? LoL. I guess the birds are certainly faster. I’ll update later. Snap caps… I thought of that… I just couldn’t find mine. And I was trying not to blow through my steel shot on practicing because of the $ but it is what it is… and Maybe some of the savings over a beretta 1301 need to be spent on the ammo.
 
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