Zbroia Kozak 177 arrived today

"airgunmonkey"

"BigTinBoat"

"airgunmonkey"Ramjet66, I get what you're saying, about the ldc, you can improvise one,

Click to expand...

All he really has to do is back off on the HS and the gun will get much quieter......and he will likely double the shot count.

Click to expand...

True, but these guns a fairly loud even thou, with just an empty tube it will quiet it down a lot, remember, his gun has a short barrel (330mm), that makes even louder.

Click to expand...

Just wondering why you think a shorter barrel makes it louder? Barrel length has nothing to do with it.......unless you have the guns (mis)tuned so that they are putting out the same amount of air. Which is why I say to tune it "correctly". If each gun is tuned correctly the gun with the shorter barrel should actually be slightly quieter. This would be due to the slightly less velocity of the shorter barrel, again when each is properly tuned. Now if you are trying to tune a shorter barrelled gun to have the same power output as a longer barrelled gun then sure the shorter one will be louder.

thanks for the reply again AGM & Bigtin, I guess you are thinking that I am being hardheaded about adjusting the H/S , & may be I am a little bit, but I have very limited use of my left arm & hand, =torn rotator & since may 5 2016 (had a stroke) my left hand has been bad, & I am not complaining , in fact I know I am very fortunate to be alive & not in a wheel chair.. but I have lost all desire to work tinker with anything anymore , I have worked on, built hotrod cars since I was 16 worked on my semi trks endloaders skidloaders Etc , got back into aiguns 8 yrs ago , went thru all of them modifying every one I got my hands on, so ,now im am 69, & don't have any interest in tinkering , working on /modifying anything anymore, I just wanted to buy a A/Gun to shoot when I feel like it.. I did shoot 5 mags =50 shots yesterday from 200 bar to around 102 bar + 13 accurate shots, then it 14th went aprox 4 inchs low. I am going outside today , we have a heat wave 52 deg , I am using up what I can from a big greatwhite sized tank, so I can change the valve to a JB dual guage setup , then I will have it filled & will be able to fill to 300 bar, AGM , thanks for the Ldc info , if I keep the Zbroia, maybe someone will start making a Ldc for it , I can get by with the noise for now , it is just loud compared to my a/g's with the Ldc's , I have been looking on youtube for Vids for adjusting the h/s , nothing yet, maybe if I saw one I would get the will to try it, have a good one guys, roger

Shutik, Thanks very much , you are the man, I gave you a like on youtube, how much does a 1/4 turn change the velocity ? , roger

"RAMJET66"Shutik, Thanks very much , you are the man, I gave you a like on youtube, how much does a 1/4 turn change the velocity ? , roger

Click to expand...

There is not and exact "formula" to determine how much. Since your gun is wasting so much air you might be able to turn it out a full turn or two and not see any drop in velocity. Best to have a chrony. If you don't have a chrony I would sight your gun in at the max distance you are accurate shooting. 40 to 50yds should be good. Shoot from a steady rest. Back off a 1/2 turn and see what happens to the POI. Keep backing it off a 1/2 turn at a time (shooting like 5-10 shots in between) noting when your POI starts dropping.
Once it has dropped 1" I would then leave it there for good efficiency. If you don't think it has quite the power then increase slightly until the POI raises back up 1/2".

"shutik"It's not linear, 
First full turn out about -30-40 FPS.

Click to expand...

But remember, from the low shot count and loudness he is describing, his gun is likely way over sprung so the first turn or two or even three should not cause ANY velocity drop.

Hey guys, I have been silently stalking this thread for a while now. I just wanted to show you what showed up in the mail this week.
I bought the .22 compact from Tony. I have been looking for a gun for my son to start using to prepare for his hunters safety class. We have tried a few different guns but haven't had much luck in our quest to find "the gun" for him. He is rather slender and has difficulty pulling back the bolt on the marauder. We tried a wildcat but he was forever double loading pellets. A few miss fires with the Taipan Veteran while trying to put the safety on. When I saw the original post on the Zboria I thought finally, something with all the features that we need. I was too late to get one from Airgun Heaven but when I read about Tony having some, I called him up and got his last one. So far we have just taken it out to look it over and shoot 10 shots down it. He can load the pellets in the mag!! Way too fiddly for him with the FX streamline mags. The confidence of being able to do it on his own was awesome. here is how it came from Tony shooting but after reading these posts we will be turning it down. The only thing I have to complain about so far is the sharp edges of the wood around the trigger. They just don't feel great on the finger but a file or some sandpaper will quickly fix the problem. Thanks for taking the time to review it and put the info out there. The smiles have been well worth it. I hope I can give him the confidence to develop a passion for the shooting sports. When he was 5 he put a 1/2 inch group on paper at 25 yards with my out of the box gen 1 .177 marauder, so I know he can hit what he's aiming at! He's 9 now so hopefully I can pull him away from Pokemon long enough to get some target time. Thanks again guys, Tyler

Here is my improvised LDC (silencer) on my. I have been building silencers for AG's for the past 13 years as a hobbie. The Zbroia has a "direct air system", most of the AG's have a "L" shape system where the air travels from a straight tunel and then up through the transfer port to the barrel, a direct system is from the air reservoir straight to the tranfer port then to the barrel, where the "sound travels quicker" hence louder report, less travel, more noise, longer travel less noise occur, it's like talking next to a person or talking to a person across the road in the same tone of voice, yet, yes, tunning the HS it will quit down as less air will leave the tube and affecting velocity (fps), again, more power, more air, less air, less power. Yes, there is a balance to be found, with minimun margin, which doesn't mean that, not wasting air it will be quiter, it will be more air efficient, hence increasing shot count, minimizing air consumption it will quiet down as less noise will coming from the valve opening but that's why we use "silencers" to have a powerfull gun with less noise.
TylerE, congrats on the new gun, nice group @ 30 yrds, hope your boy is enjoying the gun, which I like on the Zbroia is the smoothness of the trigger and the cocking action and mag loading, let us know as it progress with you guys.
Shutik, nice of you to post the vid, +10 for you!!

here it is a 10 shots group on a very good day with no wind and 27c hot weather.

"airgunmonkey"

Here is my improvised LDC (silencer) on my. I have been building silencers for AG's for the past 13 years as a hobbie. The Zbroia has a "direct air system", most of the AG's have a "L" shape system where the air travels from a straight tunel and then up through the transfer port to the barrel, a direct system is from the air reservoir straight to the tranfer port then to the barrel, where the "sound travels quicker" hence louder report, less travel, more noise, longer travel less noise occur, it's like talking next to a person or talking to a person across the road in the same tone of voice, yet, yes, tunning the HS it will quit down as less air will leave the tube and affecting velocity (fps), again, more power, more air, less air, less power. Yes, there is a balance to be found, with minimun margin, which doesn't mean that, not wasting air it will be quiter, it will be more air efficient, hence increasing shot count, minimizing air consumption it will quiet down as less noise will coming from the valve opening but that's why we use "silencers" to have a powerfull gun with less noise.
TylerE, congrats on the new gun, nice group @ 30 yrds, hope your boy is enjoying the gun, which I like on the Zbroia is the smoothness of the trigger and the cocking action and mag loading, let us know as it progress with you guys.
Shutik, nice of you to post the vid, +10 for you!!

Click to expand...

Your "logic" is failed here. Doesn't matter where the air is coming from, only thing that matters is where it is exiting. The amount and "timing"(in relationship to when the valve closes and when the pellet exits the barrel). Nothing in the air path before the pellet matters. Sure if you release the same amount of air from a direct path as an "L" path you would have more noise, but with the direct path you would not need as much air to achieve the same power, hence why turning down the hammer spring lowers the noise, quiets the gun and becomes more efficient.

I agree with you BigTin, I was trying to say is that with the same speed, it will not be much quieter, to really quiet down it gone have to sacrify velocity/power. I do agree that his gun is wasting air, I also agree that turning it down it will be more efficient with little/no affectness of power but it won't do much about the noise. Guns with "direct air system" is not very easy to quiet down just with HS adjustment, for exemple, a Daystate Pulsar and SPA P12, you can put any LDC on the Pulsar and it will quiet it down, put any on the P12 it will not due to the fact that uses direct air to the transfer port same as Jkhan rifles. I am sure you know what I am trying to say here. I completely agree with you about the HS adjust, his gun is using 5.8 bar per shot, way too much, he should back it down at least 2 turns and chrony the gun, in my opnion, the best velocity for a short barrelled guns is around 830fps/850fps with the 18gr's which it will give a +/- 27flbs/30ftlbs good for PC/hunting small game and still gives you a fairly good shot count. My rifle was shooting out of the box 960fps, way too much for me, I turned down 2.1/2 turns and now is popping 910fps/33ftlbs, didn't do much about the noise yet yes I notice a bit of difference but still not back yard friendly, that's why I improvised an "över the shroud ldc" and now I can shoot at home.

Nice rig you got there Shutik, nice group too, I see the gun is settling nicely, for sure in a supported position, would tight the groups even more for the look of it.
Nice one bro.

Hey,

how is the stock ldc / shroud working with 12fpe ?
is it quiet like with a usually ldc / silencer ? do you know the weihrauch ldc ?

do the barrel have threats ?

Thank you.
Zbroia told me today that the threats are metric M12x1
new versions of this gun should have 1/2"UNF

i dont know which newer versions... ?

Correct, the newer models (2018) are coming with LW barrel with 1/2"UNF but doesn't seems like that the thread is on the barrel, it looks like that is an adatptor/blowback from the barrel and shroud....I might be wrong dou.

And here is a pic of my barrel thread.