Internally, the XM8 is very similar to both the commercially available though now discontinued H&K SL-8, now selling for around $1000 each for those who figure having one is a necessity. And for those looking to mount scopes, targeting lasers, night or thermal vision or other battery eaters on one, Knight makes their rail interface foreend available for the SL8 in the $300 range.
Alternately, the Armalite AR180b is a stamped-receiver 5,56mm variant of the parent AR18 design, adaptable to the same XM-8 configuration if there's a market for it, and now available in the $650-$750 range.
Some custom work would be required, no big deal for someone who just HAS to have an XM8-semi. But oh yes, it could be done. It can be done right now.
