Chillywig Posted June 28, 2017 Share Posted June 28, 2017 Running a CK thunder open gun in 9 major. Actually not sure of the recoil spring weight - whatever it came with. Past few matches I have had a round in the chamber, pulled the trigger but the gun was far enough out of battery it did not drop the hammer. I had assumed it was my reloads causing the problems as I chamber checked using the hundo. Last match I had the gun go click with a round in the chamber. I have been suspect of the overly tight KKM barrels/my reloads causing the failures to fire so this match I plunked all the rounds in the barrel then dropped them into the hundo for additional inspection. Unfortunately I was unable to recover the round for further inspection. Right now if I slowly close the slide I can make it stay out of battery enough to not allow the hammer to fall when pulling the trigger. I have never had to replace the recoil spring in any of my STI's but maybe the slide frame fit was much looser and never noticed issues and I am wondering if that has been causing my problems. I have been using mobile 1 30 weight for lube and kept the gun fairly clean. I have had this gun for a year and about 4500 round thru it. Probably a similar number in dry fire. So when or what should prompt me to change the recoil spring or should I be looking at another issue causing these issues? Link to comment Share on other sites More sharing options...
59nolimit Posted June 28, 2017 Share Posted June 28, 2017 Smarter guys than me will respond I am sure but 4500 is probably close to life span expecially in a major gun. I just got a new CK Arms limited thunder 9mm last month with about 500 thru it now and you can ride the slide all the way to the last 1/8" and it will still go into battery easily. I would remove the spring and make sure the slide is smooth all the way, double check the slide where the disconnector engages, and replace the recoil spring. I was curious what # spring is in my gun and was going to send a message and ask. Link to comment Share on other sites More sharing options...
GlockGuy1 Posted June 28, 2017 Share Posted June 28, 2017 I've always been told 5K rounds. I'm not sure on a 9 Major gun, but I run a 12.5 lb spring on both my .40 Maj guns. Link to comment Share on other sites More sharing options...
jcc7x7 Posted June 28, 2017 Share Posted June 28, 2017 I change recoil and FP spring (wolff) every case of bullets. springs are cheap, Malfunctions are a PITA Link to comment Share on other sites More sharing options...
ano Posted June 28, 2017 Share Posted June 28, 2017 Ive ran 20k+ no issues, your gun should go into battery, even with a worn recoil spring down to 5-6# your missing lube, or loading wrong, or something wrong. Link to comment Share on other sites More sharing options...
molson Posted June 28, 2017 Share Posted June 28, 2017 On my Thunder 9mm open gun, I changed the recoil spring at 10,000 rounds. Only reason I did it then was it seemed like a good round number. Not one issue ever knock on wood. Factory spring is a Wolff 9lb. Your mileage may vary, but that is my experience. I would look elsewhere first, but springs are cheap. Order 3 sets and have them on hand. Change the firing pin spring while you are at it. Consider moving the Aftec spring forward and put a second one in per CK's recommendation while you are at it as well. Mike Link to comment Share on other sites More sharing options...
EEH Posted June 28, 2017 Share Posted June 28, 2017 I shot mine for a year .. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted June 28, 2017 Share Posted June 28, 2017 Hello: You guys change your recoil springs? I buy two recoil springs when the one in the pistol is 3 coils shorter than the new one I replace it. I then buy two more as spares. I test the used springs to see how close they are to the new ones. The ISMI are usually at most a 1/2lb lighter. Different spring manufacturers will have different spring life. Sprinco seems to last a long time also. Wolff has been hit or miss for me over the years. Thanks, Eric Link to comment Share on other sites More sharing options...
Chillywig Posted June 28, 2017 Author Share Posted June 28, 2017 (edited) OK here's something interesting. Just so you know I am closing the slide very slowly on an empty chamber and about a 1/16" to 1/32" from closing it can stop out of battery. It does not do it every time but it is repeatable 30 to 40% of the time. Since getting this gun new I haven't done much to it. Pinned the grip safety and put in a toolless takedown guide rod - Ah Ha! So I put in the CK guide rod still using the only recoil spring that's been in the gun and I can no long longer make the gun stay out of battery closing the slide very slowly. Upon further inspection of the toolless takedown rod I can not see anywhere it is dragging but it made a difference. Anyone else have issues with fit on the tooless takedown rod? Edited June 28, 2017 by Chillywig Link to comment Share on other sites More sharing options...
Jerome Posted June 28, 2017 Share Posted June 28, 2017 Check that the Toolless Guide Rod is not touching the comp. Mine was at one time causing the issue you are having. Link to comment Share on other sites More sharing options...
Foxbat Posted June 28, 2017 Share Posted June 28, 2017 In my years of shooting Open I never, ever changed the recoil spring. That included about a dozen of different guns, both new and used. Never sure how fresh the springs were in the used guns I bought. Truth be told, in all those years I had one hard failure - the Aftec broke in the middle. Link to comment Share on other sites More sharing options...
412 Posted June 29, 2017 Share Posted June 29, 2017 Have you ever removed and cleaned your extractor and tunnel? CK guns come with aftec extractors and at 4500 rounds mine are packed solid with dirt. Link to comment Share on other sites More sharing options...
Steelix Posted June 29, 2017 Share Posted June 29, 2017 My CK is the same way with extractor and tunnel, I clean mine out at about 500 rounds. Link to comment Share on other sites More sharing options...
RaylanGivens Posted June 30, 2017 Share Posted June 30, 2017 I noticed the same thing... The extractor (Aftec) in my Open gun gets much dirtier, much quicker, than the standard extractors in my Limited guns... Link to comment Share on other sites More sharing options...
Jerry Anderson Posted August 15, 2017 Share Posted August 15, 2017 Akai stroked gun, every couple months. Link to comment Share on other sites More sharing options...
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