700mm impact barrel on the Crown

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Honestly I'm not exactly sure what everyone is on about here. The increase in barrel length is only 10cm, which is very small and does relatively little to increase power or weight. (Just look at the specs comparisons on fx's charts) Compare that to the big heavy moderators everyone puts on the end of their guns, an extra 10 centimeters of Barrel and shroud seems like an afterthought. What am I missing?
 
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I was just talking about the barrel band idea here and don't think this endeavor is worth it in any way, but assuming people will try sticking a 700mm barrel onto a crown, I suppose one of the issues is that they're still going to be sticking a big heavy moderator on the end? Possibly along with their shroud and donnyfl adapter dangling out on the end there somewhere 😄

Considering you're putting 20cm/40% extra barrel length over the stock 0.22 crown, the flexibility of said barrel is going to increase a fair bit. We're not exactly talking about a thick steel bull barrel here. I personally already get about 12cm downward poi shift at 50m adding a relatively light moderator (one of the reasons I bought 2 of yours 😆) to my crown.

I also have had the issue of moderate bumps affecting my zero out beyond about 35m with my 500mm barrel. The bending force on the barrel at the breech end can only be worse on a 20cm longer barrel, particularly if you hit it on the end, like such a broomstick is likely to be prone to.

Anyway this won't be something I try. But you can bet someone will at some point!


 
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My apologies, I didn't mean for my post to seem as if it was singling you out, just a more general comment on the concern with that length barrel. 



That said, it is my understanding that there is no mechanically significant difference between outer barrels for the different calibers in the Crown. (please correct me if I'm wrong) Thus most of the rigidity comes from the tensioning and the outer barrel, which would be no different between the 600mm version of the .22, .25, and .30 no? If I'm wrong I'd love to learn something here, but aside from BobO's little threading issue I thought they were basically interchangeable. 



You're certainly not wrong though about the addition of another longer lever arm AND still hanging a giant heavy moderator on the end. ;) 
 
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No worries - I didn't take it like that at all :)

I see where you're coming from - you're definitely right in that the basic function would remain unchanged, if just using the barrel. You certainly can do it. I do think that there would be at least some increased droop with the extra 10cm steel barrel segment alone, considering it probably weighs close to a small moderator.

I believe the sleeves are pretty much identical except in length. You may have noticed though, that pretty much every 'official' youtuber describing the changing of liners has explicitly advised against tightening that end nut ('barely a snugging event' is how Steve described it, or something close) anywhere near the point where it would tension the sleeve significantly. May be that compressing the liner buggers around with harmonics? I'm guessing it's the sleeve itself that provides most of the structural strength though.

From my perspective it's more a case of the overall (relative) fragility of the STX system than an innate issue with the actual barrel length. It just seems prudent to avoid doing anything that may exacerbate what I have already found to be an easy system to knock out of zero, or get significant droop with the moderators nobody is going to go without. Just not worth making those issues worse for a few fps.

The slug guys may disagree though and for them, if some sort of support for increased rigidity could be found that doesn't cause issues in and of itself it might just make their lives easier. Indeed, as Broekzwans said it seems FX themselves are working on it with a fixed shroud that threads directly into the breech to improve rigidity. Though I doubt it has anything specifically to do with putting 700mm liners onto the crown, it does lend credence to the idea that these STX's are a bit 'bendy' and fragile compared with normal barrels to begin with 😜

As an aside, a fellow at my range dropped his crown with the shroud extended and snapped his 500mm STX barrel off at the breech, right by the junction of the sleeve and the brass part with the transfer port. He has since put in a CZ 😆 Doubt his PTSD would allow another STX any time soon 😂


 
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