This can also cause a failure to return to battery (even if the case is fully extracted) because it disrupts the normal travel of the slide, slowing it down.Īfter reading your comments regarding the extraction grooves I took three different makes of used shells, 1- the one I used made by Wah ordinance factory, 2- Chinese made by norinco, 3- S&B made in chez republic.Īll had exactly the same size and same shape extraction grooves and same size shell body as well. This gives the extractor less grip, and the extractor can sometimes slip over the bevel, which leaves the case partially in the chamber. On some 9x19 cases (notably on some Winchester ammunition), both areas are beveled. On the other hand, there is a gradual angle, the bevel, that marks where the extraction groove ends and the case body begins. The edge of the case head (the equivalent of the rim on a rimmed cartridge) will form a 90 degree angle to the extraction groove. On a rimless cartridge like 9x19, the extraction groove terminates at the case head. What kind of ammunition are you shooting?Įdited for further clarification: The extraction groove is located between the case head (where the primer is located)and the case body. I was trying to get some concrete information so I could help you. CZs don't like grooves that are beveled on both sides, rather than only on the side closest to the case body.ĩ9% of all problems with semi-autos are caused by the magazine or the ammunition. Yes, all 9x19 cases have extraction grooves (as do all cartridges for semi-autos), but they are not all shaped exactly the same. Furthermore if a BG pulls a pistol or a AK-47 and my cz misfires or goes into a slidejam, you would lose a friend from this forum forever. Moreover I do not know what to do if the gun does not fire at all with a locked slide?. Whereas yesterday since we could not remove the round from the chamber, since the slide and bullet were both had jammed, the range marine kept on pulling the trigger till the gun fired but it took about 10 attempts. Regarding the slide jam with failure to fire situation, this has happened once in the past, but the gun fired on second attempt to fire. This gun is a 97 model bought new from the dealer 6 months back by me, we only have gun models available from before 98 due to import restrictions in 98.My gun also has black magazine followers. Moreover this ammo has no history of any problem with my other two 9mms and neither with the guns of any of my friends. The ammo I am using is new, made by our ordinance factory under strict controls. I am obliged for your replies and comments. Please tell me whether I can use cz 100 as my carry gun safely,with the cloud of doubt always hanging around my neck,and what should I do to remove this doubt which has been hammered into my mind after today.

I have a KP95 ruger and a S&W 6904 both in 9mm, and I use the same ammo for them without a single jam or a single misfire. The shell did not come out automatically as expected, but with further manipulation I managed to disengage the extractor and the shell was pushed out by a rod from the muzzle end.Ĭan anyone advise me why all this happened. Finally in desperation I kept on trying the trigger and after about 10 trys the round finally fired. I went to the range today and had two problems with my cz100.ġ- I shot about 25 rounds, and the gun misfired on three occasions, when I fired again with the same round in the chamber it fired.Ģ- On one occasion the round would not fire when in the chamber on repeated trials plus when I tried to extract the round from the chamber by pulling the slide backwards, the slide was jammed and it would not move back, then when I tried to disengage the slide from the jammed bullet by manipulating the extractor it would still not disengage.

Different types of gun jams