I built a Romy G kit last year on a OOW receiver. Lots of fun at the range, holds groups on a regular sheet of paper at 100 yds.
But when I pull it out to show someone, the women's reaction is always the same. OMG, you have a terrorist gun?
When SHTF, you won't need 500 yd kill shots. You'll need dead on reliability at 50 yds for a lot of zombies.