I was looking for some sales today and came across a post about CZ Scorpion Evos having an Out Of Battery (OOB) problem. Having a CZ Evo (rifle) I went down the rabbit hole... Maybe I've been living under a rock but this was the first I'd heard of it and couldn't find any info here.
Turns out either the bolt and/or sear block pin can be faulty allowing the gun to fire OOB.
1) Some CZ sear blocks are faulty and will allow the striker to go forward even if they aren't depressed into the bolt. Sounds like the solution to this is to get a new factory block pin. There is also a Titanium aftermarket available.
2) The hammer riding over the bolt during reset peens the soft bolt surface around the sear block causing it to get stuck down in the bolt, defeating the in-battery safety. CZ will fix this but you can DIY just as easily by filing a small chamfer around the hole. You could be fine now but have this problem show up 1000rds later. So good to inspect once in a while.
You may have the problem and not know it. In a normal situation you would never know it. All it takes is trying to do a quick double tap or a round not fully loading for whatever reason and if you have the defect, bang...
Looks like a simple inspection once in a while could save you. There are plenty of blown up guns on reddit and youtube so definitely not a one-off incident. I will be digging mine out of the safe to inspect. Unknown how many it really affects as the conditions for an OOB are rare in of themselves. Same reports going back years exist - so I must live under a rock. Anyway, just a PSA to inspect your Evo when you clean it and keep an eye out for issues.
Turns out either the bolt and/or sear block pin can be faulty allowing the gun to fire OOB.
1) Some CZ sear blocks are faulty and will allow the striker to go forward even if they aren't depressed into the bolt. Sounds like the solution to this is to get a new factory block pin. There is also a Titanium aftermarket available.
2) The hammer riding over the bolt during reset peens the soft bolt surface around the sear block causing it to get stuck down in the bolt, defeating the in-battery safety. CZ will fix this but you can DIY just as easily by filing a small chamfer around the hole. You could be fine now but have this problem show up 1000rds later. So good to inspect once in a while.
You may have the problem and not know it. In a normal situation you would never know it. All it takes is trying to do a quick double tap or a round not fully loading for whatever reason and if you have the defect, bang...
Looks like a simple inspection once in a while could save you. There are plenty of blown up guns on reddit and youtube so definitely not a one-off incident. I will be digging mine out of the safe to inspect. Unknown how many it really affects as the conditions for an OOB are rare in of themselves. Same reports going back years exist - so I must live under a rock. Anyway, just a PSA to inspect your Evo when you clean it and keep an eye out for issues.
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