CZ mini-set and installation

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Jabol

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I have a cz 455 with a thin 22 lr barrel. I want to convert to a heavy barrel. I have a brand new heavy barrel 22lr min-set.
The instruction manual stresses to have a gunsmith initially install the barrel as material might need to be removed to achieve proper headspace.
I wanted to know if all of you guys who bought the mini-sets separate from the gun (some guns come as an extra barrel package from factory) went to a gunsmith to have the barrel first installes or did you just swap the barrels without doing the headpace checking. Is it safe in most cases to just install the barrel as it is and head to the range? I realize all guns are different and while most might be fine, some might have headspace issues after barrel swap.
 
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so when you were changing a barrel on your CZ 455 or 457, did you go through a gunsmith or just drop it in and go shooting?
 
I got a .17 HMR barrel for my 455 Full Stock that came in .22 LR. Since I own a depth micrometer, I checked myself and headspace was within spec, good to go with no modifications needed. The general consensus is that CZ makes this statement as a matter of CYA in case someone's happens to be out of spec, but most should be just fine.
 
So it seems that a good initial check would be to measure the barrel tenon length (the portion that goes into the receiver) and if it is the same length as the current barrel, then it should be good to go without a gunsmith. I don't have the go, no go 22 gauges, perhaps a good investment but I don't change barrels often enough to really need such gauges. This is a one time change only for me. What should be the maximum tenon length difference between the original barrel and the one I want to install to maintain the headspace within specs?
 
Jabol said:
So it seems that a good initial check would be to measure the barrel tenon length (the portion that goes into the receiver) and if it is the same length as the current barrel, then it should be good to go without a gunsmith. I don't have the go, no go 22 gauges, perhaps a good investment but I don't change barrels often enough to really need such gauges. This is a one time change only for me. What should be the maximum tenon length difference between the original barrel and the one I want to install to maintain the headspace within specs?
Click to expand...

The tenon length is not the only factor, your question is impossible to answer without knowing the measurement of the receiver face to the bolt nose recess in the cocked position. That minus barrel tenon = headspace, and determines what the acceptable range of tenon lengths will be for your receiver.
 
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