FX FX guns WITHOUT POI Shift Issues

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Vetmx said:
Stress free living. No topics like this to seek out for help or reassurance. You must be crazy.
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Probably... but the poor tolerances here and there and delicate or after thought engineering in the Fx's just doesn't do it for me. I started with a Tarantula and a lot of things about it are pretty incredible... like the exhaust valve design, but things like the trigger and hammer system are not that good. Similar issues with the Impact but had a number of tolerance issues in it. The Royale is probably the best thing they've made that I've experienced...
At my age, just trying to shoot what I enjoy and wade through the long list of projects that have accumulated... 😃
Bob
 
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There is a point.

The POI shift is rather a relative thing.

For casual shooters and most hunters the slight POI shift is not a problem.

For keen precession shooters I mostly find that even a slight POI shift is a problem.

Royal 400 is great in POI consistency.

I understand that one of the reasons of keeping the liners inside the cylinder or plenum in Panthera and DRS is to avoid POI shift.

Almost all the PCP models of FX are currently being made on liner system. So changing the liner system means redesigning of all the models of FX as far as the balance of the gun is concerned.

The liners are very accurate but are mostly unsuccessful in creating a consistantly precise and accurate truck gun.

Many users having liner system using the gun in their trucks complain about this issue while similar users of Cricket do not face this issue.

Bhaur
 
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1300usd firearm barrel straightness testing vs 2200usd pcp barrel straightness testing

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matijann said:
1300usd firearm barrel straightness testing vs 2200usd pcp barrel straightness testing

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I'm moderately certain that their definition of 'straight' is significantly different than mine. They MAY be 'straight' prior to the lands being pressed in but I've got serious doubts that tube remains within .001" over 600mm I've rolled mine on a granite counter top, sorry but my certified surface plate wasn't available, and they were most definitely deformed. Honestly for how they are made they are pretty good.
 
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HogKiller said:
.... I've rolled mine on a granite counter top..... sorry but my certified surface plate wasn't available, and they were most definitely deformed. Honestly for how they are made they are pretty good.
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I did several that same roll test, and realized as well that actually nothing proves.
The barrel tube can be bent, also the barrel attachment and the transfer port... so basically four parts attached together with machined threads and each can have a run out.
But the liner is supported on two very ends only and no hard contact to any outer metal part other then couple orings. The liner is pressed between the liner lock and the brass transfer port. Yes, stretching like a guitar string would be better but how to make that is a science fiction.
 
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I use barrel bands on FX rifles when I can. I like that saber tactical provides them in their rails and they work well. Other than that I use black arts barrel bands. Took away any noticeable POI shifts. But to be fair only noticed POI shifts on my first Impact MK2 a few times back in 2020, but that got fixed with a new rail and a carbon sleeve when I could afford to upgrade the parts. Barrel band just sealed the deal. However, I am still careful not to be stupidly rough with the impacts. Have you guys checked out saber tactical’s new M4 full length backbone rail? I got one for my M3. Man it sure is nice. Really locks the impact together like the airmarksman backbone, but more sleek, lower profile, and integrated barrel band.
 
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mubhaur said:
There is a point.

The POI shift is rather a relative thing.

For casual shooters and most hunters the slight POI shift is not a problem.

For keen precession shooters I mostly find that even a slight POI shift is a problem.

Royal 400 is great in POI consistency.

I understand that one of the reasons of keeping the liners inside the cylinder or plenum in Panthera and DRS is to avoid POI shift.

Almost all the PCP models of FX are currently being made on liner system. So changing the liner system means redesigning of all the models of FX as far as the balance of the gun is concerned.

The liners are very accurate but are mostly unsuccessful in creating a consistantly precise and accurate truck gun.

Many users having liner system using the gun in their trucks complain about this issue while similar users of Cricket do not face this issue.

Bhaur
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Although there are lots of options for very accurate truck Airguns out there, like an RTI P3 or an AGT Uragan, many do own and very much enjoy for example an Impact. I do think FX and their liner system is hardy enough to be used as a truck gun hunting set up with lots of success and enjoyment. I use an Impact all the time for hunting without any issues. An example where this would be needed is for the sportsman that can only afford one high end airgun with the needed accessories. He/she chooses FX as many of us do. With the right modifications and the right tune, their airgun can and will be very robust and very capable in the field as well as be able to transition to the bench and compete with a high degree of accuracy. Can FX keep their designs and make them more robust? Absolutely, especially with the many contributors that have come and gone with ideas they have used over the years. Much like your amazing fix to regulator creep. Their designs can be improved on but keep FX from having to completely revamp their whole rifle lineup. CNC machining is really coming in to its own and FX has no excuse not to really get their modular barrel system improved.
 
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wijib said:
My new Royale (the last walnut 400 made) is fine. No POI shift. The way I have the barrel in the tripod is for photographic purposes only.;)
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5 shots 25 yds
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My understanding is that none of the Royale-Boss platform guns showed signs of POI shift that was not externally induced.
If one considers my experience as valid (70 yards and below) , then it is certainly true.
just my too mrad
Edward
 
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