Save the Furis to build the Afuris dual machine pistol, it's blueprint is available from the market for 15,000 15,000. Discounting the Orokin Cell, the total cost runs to 65,000 65,000. Note that no matter what level the two Furis used are, the level of the Afuris will be 0 and have its own mastery points. As such, either use two unranked ones or have one rank 30 Furis when making the Afuris (otherwise you would have to re-make a Furis to get the remaining mastery points).
A Lotus symbol seems to appear at the end of the magazine, justifying itself as a Tenno weapon.
The Market blueprint icon of the Furis once did not have the appearance of the actual model, instead it lacks a magazine, its stock appears to slender inwards (without having a "butt" on the end) and its barrel has edged below (making a spike of some kind). This has since been fixed in recent updates.