FX Crown upgrades and questions

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I owned a impact then sold it to buy the crown. IMO the crown adjustments and access to the major components for repair has easier access on the Crown. I think I shoot better with the crown because of so many years of shooting a standard rifle configuration. I found the bull pup is a little more sensitive to inconsistencies of the way you hold the gun. My groups have tightened up with the crown over the impact. I really like my green laminate stock also. 
 
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@AirSupply Thank you for the clear and concise explanation and follow ups. Much more clear now. Ernest was also very kind to give me further clarifications.

I wonder why the 700mm is called a "sniper" version? The extra 100mm length (about 4 inches) should not be a major factor in improving accuracy. I assume the barrel thickness is not significantly (if by any) more. 10-15 fps higher velocity is a given but again, that's not related directly to accuracy unless the velocity was previously lacking for a particular pellet. One thing it may help with is: the shooter. Longer barrels are easier to aim and keep on the target. What am I missing? What is the history/demand behind the 700mm?

So, if there are no discernable advantages to the 700mm vs 600mm, then the smart thing would be IMHO to get the standard 600mm X-twist barrel/liner that way I can swap it out from my Impact to a (future) Crown and vice versa. Also, I would assume that in the future the liners for the 600mm versions (with various twist rates, etc) would be more available for purchase vs. the 700mm barrel version.
 
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fe7565 Fx had some of the 700mm barrels at extreme benchrest. Matt Dubber came 2nd with one in 30cal. After the competition AOA sold a couple of these Impacts and referred to them as Sniper Barrels. I don’t know if that is officially what fx calls them. 
There could be some acccuracy gains in the fact to achieve the same velocity with a pellet you need a softer hammer strike and lower reg pressure. Less recoil. Also less air turbulence around the pellet. 
2D1c
The Crown barrel in 25&30cal is 600mm
There won’t be anything to stop people fit the 700mm barrel to the Crown I can think of. But I think it has been designed for the Impact. 
 
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