Actually just speculating, but isn't it the longer the barrel back, the better the accuracy?
the sly barrel backs are not only expensive, but also quite short by the looks of it
If you've got the cash & just want the looks but not accuracy then feel free.
A front alone costs $100
and each back is $30
or a set of 4 for for $90
you would be better off just buying a good quality kit if performance is what you're after, it would be cheaper.
Or if you like Carbon fibre there's the 'stiffi' range, & you can get stiffi fronts for some barrel kits I think.
I have heard that Redz are exceptional, and the pipe kit is good as well
I could sooo work on a shopping channel