Handl Defense has developed an aftermarket aluminium lower receiver for the FN SCAR 17 to replace the factory polymer lower. Their SCAR25 lower (urgh, FN is not going to like their trademark being used in this way) allows the use of SR-25 and M-110 compatible magazines made by Magpul, XS , DPMS and POF. They have also made some modifications that compatibility with a greater range of AR-15 grips.
The price is for the SCAR25 is $300. It is available in tan or black. Handl will begin shipping the lowers this month.
[ Many thanks to Tim for emailing us the link. ]