Jody Waring Posted August 24, 2014 Share Posted August 24, 2014 What is the most common cause for double feeds in a CZ Shadow? Been getting a few lately with two different batches of ammo. Mag springs are good extractor is good as is the spring. The two bullets I'm using I am loading to 1.105" to clear the chamber. Got a big match coming up and sure would like to have this sorted out. Thanks for your input. Link to comment Share on other sites More sharing options...
GrumpyOne Posted August 24, 2014 Share Posted August 24, 2014 Read it all and do mod #2. It will stop the double feeds. http://www.czfirearms.us/index.php?topic=22862.0 Link to comment Share on other sites More sharing options...
alma Posted August 24, 2014 Share Posted August 24, 2014 Read it all and do mod #2. It will stop the double feeds. http://www.czfirearms.us/index.php?topic=22862.0 I was going to suggest checking #2 as well. Make sure y\that edge is "broken" and it's polished on the underside. Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 24, 2014 Share Posted August 24, 2014 Have you changed anything lately? What type of bullets are you using? Link to comment Share on other sites More sharing options...
Jody Waring Posted August 25, 2014 Author Share Posted August 25, 2014 Have you changed anything lately? What type of bullets are you using? Nothing other than the gun being clean, I've done that mod for the breach face a long time ago. It's quite odd as I went quite some time without having this problem. Any particular brand of brass more apt to drag the next round in the magazine? I need to measure some as some appear to have larger diameter rims, or does that even make sense? 147gr flat point and 124gr RN both are plated. Link to comment Share on other sites More sharing options...
eerw Posted August 25, 2014 Share Posted August 25, 2014 Jody.. Double feed? actually two bullets being fed at the same time?? or is the malfunction different? live round, emtpy case in chamber, or live round empty case in ejection port? Link to comment Share on other sites More sharing options...
Jody Waring Posted August 25, 2014 Author Share Posted August 25, 2014 Hi Stu. The next round is pretty well stripped from the magazine and the top round is either chambered or nearly but not picked up by the extractor. It's almost like somehow the bottom round pops the top round free from the extractor and is merely pushed forward without being grabbed by the extractor and locked to the breechface as the slide comes forward. Not sure if I'm making any sense or not, l need to stop and take a pic the next time it happens. Thanks Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 25, 2014 Share Posted August 25, 2014 Are you tumbling your loaded rounds? They sure do get slick Link to comment Share on other sites More sharing options...
Jody Waring Posted August 25, 2014 Author Share Posted August 25, 2014 Just the brass then I load. I use extra power mag springs too you would think that they would help keep the round in place in the magazine and prevent if from moving forward. Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 25, 2014 Share Posted August 25, 2014 I hit the brass for 45 min, then load em and hit em for another 45; it cleans all the gummy residue from the dies and leaves them slick as snot, they peel out of the mag nice and smooth. Link to comment Share on other sites More sharing options...
eerw Posted August 25, 2014 Share Posted August 25, 2014 does the round chamber empty? so essentially it is a failure to extract? mixed brass? when this happen. track the brass type. Link to comment Share on other sites More sharing options...
Jody Waring Posted August 25, 2014 Author Share Posted August 25, 2014 There's a loaded round in the chamber with the next round in the magazine stripped free of the magazine or nearly free which locks the gun up. Mixed brass yes. I'm leaning towards that being some of the problem. Link to comment Share on other sites More sharing options...
basman Posted August 25, 2014 Share Posted August 25, 2014 Does it do this with only one magazine, or all of them? Link to comment Share on other sites More sharing options...
Lee G Posted August 25, 2014 Share Posted August 25, 2014 If I'm understanding you correctly the round being fed is getting locked up by the extraction claw causing it not to chamber. I've seen this happen when people replace the extractor spring with one of the extra power springs. Another issue I've seen is getting oil around the breach face. It will quickly build up gunk under the extractor and in the firing pin hole causing failures to feed, extract and light strikes. Degreaser and a brush will fix this. The breach, firing pin channel and extractor should always be dry. There is nothing in this area that requires lubrication. Link to comment Share on other sites More sharing options...
CZinSC Posted August 25, 2014 Share Posted August 25, 2014 There's a loaded round in the chamber with the next round in the magazine stripped free of the magazine or nearly free which locks the gun up. Mixed brass yes. I'm leaning towards that being some of the problem. Sure sounds like a mag spring problem to me. I know you said you have new +10's in them, but are you cleaning your mags after they hit he ground? Could be some gravel/sand interfering just enough with the follower not allowing it to be at full tension from the spring. That's the only thing i can think of. Link to comment Share on other sites More sharing options...
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