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CZ 455 Lux .22 LR will not fire

1.6K views 9 replies 8 participants last post by  Guy  
#1 ·
I bought a new 455 Lux in .22 LR three weeks ago. I cleaned it thoroughly then took it to the range and fired about 100 rounds. I cleaned it again when I got home from the first trip. Went to the range about a week later and fired 14 rounds the 15th would not fire. I tried about ten more (all CCI mini-mags) and was getting light primer strikes on all of them and none would fire.

I brought it home cleaned the gun and dissembled the bolt. I found some kind of gunk had collected in the conical section of the bolt where the firing pin stops. The firing pin had hammered the stuff until it was hard as a rock and I could not get it out with a copper wire. I soaked the dissembled bolt for 30 hours in Hoppes No. 9 and was finally able to dig whatever it was out then brushed it down put every thing back together and I thought the problem was solved.

I took the gun the range again last Thursday and it fired the first round, but would not fire any subsequent rounds. Again I was getting light primer strikes. I brought it home and dissembled the bolt, but There were no obvious problems I could see (but maybe I don't know what to look for).

I called CZ and they want me to send it in for repair and sent me a shipping label. I hate to be without the gun for 4 - 6 weeks and thought I would see if anyone here has had that problem and was able to fix it themselves.
 
#3 ·
Just by looking the firing pin appears to protrude far enough to get a good strike and that makes me wonder if the firing pin spring is messed up, but I don't have any way to tell. The first round that fired on my last trip to the range looked like a normal strike, but the ones after that barely made a tiny dent in the case.
 
#5 ·
Before anything else, check the barrel retaining grub screws. If they've loosened or were not properly tightened at the factory, the barrel may have migrated forward enough to create a head space problem.

If the screws seem OK, I'd loosen them and re-torque them to 44/45 inch pounds.
 
#7 ·
That's the best probable cause I've seen. The problem is I have no idea what a grub screw is and I don't have a torque wrench (or torque screw driver). A head space problem caused by barrel movement makes sense to me, but I don't have the tools to correct it if that is the cause.
 
#9 ·
Yup, I bet it's the barrel grub screws and after the first shot, the barrel is moving forward enough to cause a head space problem. :t