CZ 600 Trail - Interesting Details!

owlowl said:
Do I understand correctly that the forend is only attached by clumping on a plastic friction ring over the barrel and then receiver connects to plastic lower by 2 action screws only so forend is hanging on just a barrel, is that so?
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Yup, You've got it. Good to know that my explanation was clear. Better yet, the Barrel is held into the Receiver by clamping force based on the 2 Barrel Tensioning Screws. And still, despite a quick-change Barrel design, it shoots sub-MOA with the very first factory load that I tried....
 
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Can-down said:
Nice.
Thanks again for taking the time to share your findings!

I think I can make out the pin under the flip up sight protruding near the rail.
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Yep, you got it - that's the Indexing Pin for the Handguard.

I am happy to share what I find out about this intriguing little offering from CZ! It really is a "cute" set-up. I don't think that the friction-retention for the Handguard is going to be a problem under recoil from .300 Blk, as there is a lot of clamping area and force applied by those 3 Tensioning Screws. Same with the Barrel's friction-retention system. I can't see the Barrel walking out of the Receiver under normal conditions of use, as the Barrel and Bolt are locked together when firing occurs. I'd say that the CZ engineers knew what they were doing in designing the Trail such that it is as light as possible, as economical as possible to build, and accurate/reliable to CZ's normal standards (whatever those might be....). They did play their cards close to the chest with accuracy expectations for the Trail, which is consistently and readily exceeds. So much for 2 MOA, mine was sub-MOA with the first "premium" factory load that I tried.
 
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Did you check headspace after reassembly?

Is there a specific order the barrel retaining screws have to be screwed in?

It’s my understanding it was supposed to be “idiot proof”. I might be confusing the procedure with the m03
 
conor_90 said:
Did you check headspace after reassembly?

Is there a specific order the barrel retaining screws have to be screwed in?

It’s my understanding it was supposed to be “idiot proof”. I might be confusing the procedure with the m03
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There is really nothing that could go wrong if you pay attention to what you are doing. The key is to ensure that the Barrel is fully seated into the Receiver, where it bottoms out against the Receiver Recess IF you make sure that the Indexing Pin is correctly seated in its slot. There is no headspace ajustment per se, as the Barrel is either fully seated in the Receiver, or it is not. If you can rotate the Barrel, then the Indexing Pin is NOT correctly seated in its slot and you must continue to rotate the Barrel until such time as it bottoms out when the Indexing Pin drops into its slot. Then you can tighten the Barrel Retaining Bolts. I did it a little at a time, alternating between the two Receiver Bolts. I don't think that it matters which Bolt is tightened in which order, so long as they are both snugged up then tightened in alternating increments. The "test" is whether you can close and lock the action by pushing the Bolt Handle down into the locked position, If so, your Headspace will automatically be correct. If not, you need to loosen the Receiver Bolts and rotate the Barrel further until it drops down into its Indexing Pin Slot. Then re-tighten the Receiver Bolts in alternating increments to lock in the correct Headspace.
 
Bartok5 said:
...Then you can tighten the Barrel Retaining Bolts. I did it a little at a time, alternating between the two Receiver Bolts. I don't think that it matters which Bolt is tightened in which order, so long as they are both snugged up then tightened in alternating increments. The "test" is whether you can close and lock the action by pushing the Bolt Handle down into the locked position, If so, your Headspace will automatically be correct. If not, you need to loosen the Receiver Bolts and rotate the Barrel further until it drops down into its Indexing Pin Slot. Then re-tighten the Receiver Bolts in alternating increments to lock in the correct Headspace.
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On my receiver there is a a single dot over the bolt closest to the trigger and two dots on the one muzzle side.
My receiver is marked 5 Nm (~44 inch pounds) adjacent to the bolts, so it stands to reason they are torqued first and then second to 44 in. lbs.
 
beltfed said:
On my receiver there is a a single dot over the bolt closest to the trigger and two dots on the one muzzle side.
My receiver is marked 5 Nm (~44 inch pounds) adjacent to the bolts, so it stands to reason they are torqued first and then second to 44 in. lbs.
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It was my understanding this was the case

I thought there were three bolts for some reason, maybe on the 6 lug models

I don’t know if I’d be down with “ if the bolt closes send it” without ordered procedure and torque specs after the recall, you do you though
 
conor_90 said:
It was my understanding this was the case

I thought there were three bolts for some reason, maybe on the 6 lug models

I don’t know if I’d be down with “ if the bolt closes send it” without ordered procedure and torque specs after the recall, you do you though
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The barrels on the mini actions are two bolts, so yeah the three bolts are likely the mediums and above.
Keep in mind the minis are aluminum receiver, and I'd surmise all of the mediums and above are steel actions.

I suspect at some point the appropriate procedures to barrel replacement will become leaked / common knowledge, and either CZ will lament and provide support or the aftermarket will fill the void.
 
I don’t know if a leak is needed I read the description somewhere and it sounds like it’s labelled on the barrels themselves

The alpha models have alloy receivers in long actions
 
The Trail Receiver is flat-bottom, constructed of alloy with 2 Barrel Retaining Bolts - one long, and one short, both the same thread-pitch. There was no thread-locker used on the Bolts - just some red lacquer on the Bolt Heads. The Torque spec is engraved on the Receiver itself - 5 Nm / 44"lbs - which actually seems scary tight on alloy threads, but whatever.... There is no apparent marking on the Barrel, Receiver or in the manual to indicate a specific order for tightening the Barrel Bolts. The manual does state that the Stock (Action) Screws are to be tightened beginning with the Rear (Trigger Guard) Bolt, but nothing about the Barrel Bolts themselves:

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You can see the dots in the line above the screws, can’t confirm if that’s the intended order but I’d guess so
 
conor_90 said:
You can see the dots in the line above the screws, can’t confirm if that’s the intended order but I’d guess so
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Ah, yes - seen! Thanks for that. Sometimes we can stare at the obvious forever and not see what is right in front of us! Oddly enough, those markings are almost invisible to the naked eye, and are near-impossible to decipher without the enlarged photo....

E.T.A. - Although the Trail was designed to be a switch-Barrel calibre-change system, I wouldn't want to perform too many Barrel swaps over time, as there are no steel heli-coils in the Aluminum Receiver to prevent wear and stretch in the threads for the Barrel Bolts.
 
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lone-wolf said:
So the barrel just slips in and is held by clamping force by these two screws?
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Yessir. Barrel to Bolt lock-up is with lugs in the Barrel itself, thus ensuring correct Headspace. No stress is placed on the Barrel/Receiver connection as all firing stress is contained within the Barrel/Bolt assembly when the two are locked together. The Barrel does have a detent for an indexing pin within the Receiver, which ensures that the barrel is correctly and consistently oriented when it is secured by the Receiver Clamp.
 
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This has been an invaluable thread, and has rekindled my interest in this platform. I don't really have an increment weather rifle per say, and an Alpha keeps checking my boxes.
 
The Kurgan said:
This has been an invaluable thread, and has rekindled my interest in this platform. I don't really have an increment weather rifle per say, and an Alpha keeps checking my boxes.
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I am pleased that you have found the thread to be useful! I seem to enjoy sharing neew platforms with the CGN membership, be it the Templar, the R18 or (now) the CZ 600 Trail.
 
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