A carbon fiber bottle typically saves about a pound compared to a steel tubular air tank, even at double the air volume! It may make the rifle seem front heavy on a bipod since the mounts for the bipod are generally positioned further rearward-- but there are pic rail extenders for some rifles to move the bipod forward if desired. I'd bet that most rifles that feel front heavy have other parts contributing to that feel, such as wood stocks, long steel shrouded barrels, or a heavy action such as in a Hatsan or a RAW.
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