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gianmarko

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About gianmarko

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    Gianmarco

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  1. thanks yigal. so you think that the lateral play between comp/barrel and slide will not affect accuracy? that i can test anyway. why not. last time i adjusted the comp i indeed used my lathe, too lazy to install the 4 jaws chuck but some shimming did the job, i removed .2 mm if i remember well. some time ago i did some tests with different springs, the results should still be on this forum somewhere. i installed a position sensor on the slide and measured slide speed with different springs. what i saw is that with different springs the speed of the slide in opening does not change much, i could not measure the difference. what changed was the speed of closing, which was slower with weaker springs, obviously. but i might give it a go with a stronger spring. i dont use very weak springs anyway, i think i am on a 11lbs now regarding the slide lock pins, i am currently using those pins coming from an ingersoll rand impact hammer (p/n 2112-704). they seem to last a bit longer than the standard pins, but they also break. i think they l;ast 7-8000 rounds, but they are cheaper than CZ ones. Robin Sebo was selling some different pins, cheaper than CZ at 12 euro, got a couple of them and will test them
  2. hello everybody has been some time and seems i need again advice from the experts here last thursday at the EEO i broke my third barrel. second in a match, murphy's law... i am fitting a 2017 barrel with the improved lug, as per instructions here https://imgur.com/gallery/TMIXx adjustment is almost complete, but reassemblying the barrel to slide and compensator i have again a problem: giving the comp 24 turns, i have a 0.85mm gap between comp and slide, as the thread is 1mm, if i give 25 turns the gun will not close i had a similar problem when fitting a new barrel last time i had one fail around 18 months ago, and had to machine a couple tenths of mm off the comp to ensure proper coupling i have checked other barrels i have (broken and good) and the number of turns of the compensator to the barrel varies between 23 and 25. the other checkmate i have has 3 barrels that can be exchanged and comp will fit properly. i can either machine a couple tenths mm off the comp so i can give it 25 turns and have a good coupling, or i can leave the 0.85 gap, but then i have a play between barrel/comp and slide of 0.12mm ( a bit less than 5 thou, which seems excessive to me) any suggestions on how to proceed? a dutch shooter told me that he had an improved lug barrel fail in his gun. seems that CZ cant solve this problem...Robin Sebo told be the new barrels dont fail but probably they still fail, maybe just less frequently. this barrel failed at maybe 12k rounds. previous one failed at less than 10k in the other CM the first barrel failed at 15k rounds or so, the current barrel has over 30k, thats why i was shooting the other CM at the match. pretty annoying...
  3. to be fair i rarely saw shadow or shadow2 fail or malfunction during matches. id say they are some of the most reliable guns around.
  4. they dont however say that they never replaced any part i have personally seen shadow 2 failing during stages. in both cases it was the trigger return spring, but that disables the gun.
  5. i suspect MK pistol was not exactly the same that they sell to us commoners at any rate i am not complaining, the gun shoots very well, and its on average a lot more reliable than many other expensive pistols i see in the hands of colleagues. at the mo the CM its sold at 3.8k swiss francs including ther spare barrels, and i see other people forking out close to 6 for other guns that then require another 1k of gunsmithing in order to run reliably
  6. ok i have machined 0.3mm off the back face of the comp and now it fits perfectly. man, these guns are funny. there is 0.5mm difference in lenght between the slides of the two CM. i suspect in the factory they machine the slide, not the comp, to mate them
  7. lol well the CM n.1 is very well adjusted then is time to get the 4 jaws chuck out, i cannot be trusted handling a file
  8. so i chamfered a tiny amount the outside of the barrel muzzle and now the comp threads to the end but the troubles continue turns up when the comp is completely screwed in, the barrel-comp assembly is some 0.1mm too short so the barrel doesnt sit completely in the slide , and the slide drags in the first cm of travel when racking. with one of the two spare barrels is worse and the gun will not close on the force of the spring alone. so if the comp is installed like it in the picture, with the 1 mm gap between slide and comp, the gun works fine, albeit there is a little play at the coupling slide-comp if i screw it in one more turn the barrel remain a tiny amount unseated towards the slide and the whole thing drags. in fact, i always noticed this drag in this pistol when racking the slide, but was minimal so i either live the 1mm gap and leave the comp unscrewed by 1 turn, or i need to remove some 0.15mm either from the front face of the slide or the rear face if the comp the guy who adjusted the pistol in the factory did a pretty sloppy job. the CM n.1 doesnt show any of these and everything works fine, no matter which barrel i fit. the CM n.1 shows a gap of 0.15mm between slide and comp any opinion? thanks
  9. actually on the CM n.1 the barrel n.2 is now at perhaps 30 or 35k rounds and still going. i know a guy who is at 50k and still going. no, i thread the comp with the barrel not in battery and the spring out, and cant turn it any further. something is hitting the end of something else. either the thread or the barrel into the comp. i have measured and looked with a microscope at the different barrels. threads are absolutely identical and so are sizes, i suspect the comp hits the barrel muzzle and bottoms, the only difference i could find is that the broken barrell has a small chamfering at the muzzle. later will put some marker on the new barrel and see where it bottoms.
  10. aaaand more problems i have installed one of the two spare barrels and i get this gap between comp and slide looks like they forgot a thread, there is exactly 1 mm gap. wtf? both spare barrels show this problem i counted the threads and they are 24 on all barrels. so not sure i should put the barrel in the lathe and add one thread or what. and btw, anybody knows the difference between A and B serial number guns?
  11. broken barrel n.2 this one belongs to another CM i bought second hand from a colleague he only shot factory ammo and was lightly used. so much so that he was still using the original slide stop/hold open barrel is marked 2015 i shot perhaps 5000 rds on this gun, around 165PF this barrel looks identical to the one that failed in my CM n.1, that was manufactured in 2013 the second barrel from top is a new barrel from my CM n.1, manufactured in 2013 the third barrel from top is the new 2017 barrel. the lug, in the area that fails, is 0.5 mm thicker, and profiled slightly differently now my doubt is whether the failure was caused or accelerated by the handmade slide stop pin im using. it is 0.04mm thicker than the CZ slide stop, and it looks like it mates the cam in the lug even better than the stock CZ pin
  12. in the meanwhile i got some of those impact wrench pins. they are tough, i tried to machine one to shorten it a little and it vaporized the chisel insert i shot a match with it yesterday, looks good, no problem so far. if it solves the slide stop problem, ill get a beer or two to the guy who found this out.
  13. Hi Matt i have a CM barrel with some 30k rounds and no issues so far. i know a guy with a 2013 CM and over 50k rounds on the same barrel no issues the barrel i broke was probably less than 7k rounds. it doesnt seem to be a regular occurrence like the slide stops. by the way, another shooter i know claims that at 12k rounds her barrels lose precision and need replacing. never heard such thing before. i havent noticed any loss of precision in my CM,
  14. Yigal your informations are really very appreciated, thanks a lot. ill look into fitting one barrel after xmas holidays. ill try to make more accurate measurements and update on progress gm
  15. is probably over 0.5 in my case, ok is not "a lot" but not something i can remove with 2 licks of file :-)
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