I have tried both but prefer the javelin spartan myself, I also like the fast on fast off of the javelin. I have heard that the new backlanz is better with tighter tolerance than the original carbon and therefore less play (that was my one criticism of the backlanz).
At the end of the day they are both great units, I just don't know if the backlanz is worth 2x the cost of the javelin.
The only other criticism is that the javelin really require the flush cup bedded into the fore to get the best fit and to be able to load the bipod up, this is not a difficult job just a hassle.
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