Might be picking up a FDE SCAR-17S but it has a Handl MK17 lower. I plan on keeping that lower on the rifle but I have a bunch of factory mags and I'm considering getting a factory lower as well. Can't hurt to have both I guess. Used is fine, and I see HDD sells "take offs" but they're out of stock. Also, any suggestions on where to find a parts kit for the trigger housing? I'll toss the stock trigger in the FN lower and toss the Geiselle trigger in the Handl lower.