This subject has been addressed here several times. The last thread not so long ago, but I could not find it. This is not an accuracy issue. These Crowns are very accurate, but they do not like traveling. I have suffered POI change from session to session. Forcing me to always test the POI every time I use the rifle and I am not alone. Well, the reason for this thread is that I have just received a brace that fits around the shroud and the carbon bottle clamping to the bottle. This brace was 3D Printed in plastic and sold by Ohio Airguns for $20 . I am super impressed with its precision fit. It fits firmly to the shroud with "zero" clearance yet slips over the Carbon bottle occupying all the space between the shroud and bottle applying no pressure to the shroud either up or down even when the two clamping screws are tightened. With the FX design the barrel is fixed only at the receiver. The shroud adds no additional support, so the barrel can be disturbed with only the lightest of forces. This brace really solves that issue. This solution is simple, but very hard to execute. I have seen other 3D Printed parts and I have not been overly impressed. With the form and precision fit of this piece, I am very impressed. I have not tested the gun yet, but I have confidence this will solve the loss of "ZERO" issue. I will get back to the forum with my test results.
FX Crown owners please read, loss of zero session to session
- Thread starter steve-l
- Start date
@steve-l, so how is the shroud attached to the receiver? The shroud on my Bantam screws into the receiver for a rigid fit. Just curious as to how it’s attached on your gun.
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steve-l, which model do you have? And wondering if the newer models suffer from POI shift? (four screw barrel attachment and/or the new Superlite barrel). Owners please chime in.
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I had the same issue with a Crown. I think it is mostly related to the complex and fragile liner and sleeve design. IMO, the Royale platform is the best thing FX has made.
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Simple fix. Store it in a case that holds it firmly. Once the gun settles in, zero is set. If it's been resting on the barrel, pick it up, and gently push the barrel left right up and down so it settles back where it was.
Cold weather will affect zero. Let the gun cool down to working temp. Check zero. If you bump the barrel in the field, gently push it left right up down. It'll settle back where it originally settled. That's why I love my 380mm barrel. Never a worry about bumping it in the brush
Cold weather will affect zero. Let the gun cool down to working temp. Check zero. If you bump the barrel in the field, gently push it left right up down. It'll settle back where it originally settled. That's why I love my 380mm barrel. Never a worry about bumping it in the brush
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I have had no issues with my Crown. I store it laying flat on a bed and always travel with it in the case.
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It would be great if it were that simple! I treated my Crown exactly as every other rifle, which is with care. The darn thing would shift POI for no discernible reason. I currently have two Daystate rifles, a Red Wolf and a Wolverine, both have shrouds with moderators attached. I can remove moderator and shroud, re-assemble, and the POI will remain within a quarter inch at 25 yards. That process with the Crown would move POI enough that I would never trust it on a squirrel head size target.
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My Crown is just a year old. The shroud just slides on the barrel tube. It does not attach anywhere else and that's the problem. The barrel is 600mm long plus the moderator and that's one hell of a lever. It takes very little force to disturb it.
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Got 2 Crowns banging around in the back of a 4runner being towed from Wa to Ca and Az. One in case one rapped in paking blanket because the ATN with ABL attached won't fit case and a couple thousand doves must have committed suicide. One with the pull out shroud 500mm and one 380mm continuum, both held POI never changed from home.
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Check your liner sleeve assembly. Sounds like your liner retaining nut or something isn't torqued to spec. Sounds like something is loose.
I'm not familiar with your barrel assembly, however. Mine simply has a jam nut that holds the liner. And a fixed shroud.
I'm not familiar with your barrel assembly, however. Mine simply has a jam nut that holds the liner. And a fixed shroud.
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Once secured the Continuum barrel (4 screw version) stays in place, but if you loosen the screws to remove the barrel, it does require a little adjustment to reattain zero. Session to session though, it's very secure.
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Consider yourself very fortunate. I have this issue and many others also have it too. It is not an accuracy issue, nor is it a temperature issue. Yes, it does settle back to another POI, but the issue is which one will it use today. I am a competent gunsmith and a machinist with my own machine shop. This problem is real and it affects many others as well. I am not alone. This brace is very well made and I have much hope that it will solve the issue. The Crown barrel is a piss poor design that is very frail. This brace, if nothing else, is cheap insurance at $20 for a $2500 air gun. It certainly cannot hurt.
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Mine (pre continuum crown) used to shift POI until I got rid of the stupid sliding shroud. Even locked all the way back it was detrimental to stability and overall precision.
I replaced the shroud with a 20mm OD carbon fiber wing tube (this OD fits snugly into the shroud recess in the action), cut to a fraction of a mm longer than the barrel sleeve and centered with 3d printed bushings. I attach my donnyfl koi directly to the 1/2inch unf liner securing nut and when fully screwed in it slightly tensions the whole assembly. Whether that's made the difference or if it is just the removal of the OEM shroud I don't know, but I haven't had any POI shift at all since.
I replaced the shroud with a 20mm OD carbon fiber wing tube (this OD fits snugly into the shroud recess in the action), cut to a fraction of a mm longer than the barrel sleeve and centered with 3d printed bushings. I attach my donnyfl koi directly to the 1/2inch unf liner securing nut and when fully screwed in it slightly tensions the whole assembly. Whether that's made the difference or if it is just the removal of the OEM shroud I don't know, but I haven't had any POI shift at all since.
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I follow the same set screw tightening order. Back left, front right, back right, front left. And I do it by hand, and try and apply the same tq. I bet if I used a tq wrench results would be better. But I can get almost if not the same zero. Repeatably
Also, that's good info macros. I have a 500mm barrel with sliding shroud and have not experienced zero shift. But I barely have used it ever, and always at close ranges, so who knows.
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The Canadian barrel is glued together with the shroud tube somewhere inside (because moderators and silencers of any kind are prohibited), I am hoping that shall be more clever design vs a free floating barrels.
I had a cheaper 22 cal project gun the POI was shifting all time until I locked the barrel to the air tube, now its not that so bad...but all design issues shall go towards bullpop to hold the barrels at least in two points.
I had a cheaper 22 cal project gun the POI was shifting all time until I locked the barrel to the air tube, now its not that so bad...but all design issues shall go towards bullpop to hold the barrels at least in two points.
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