Magpul Core for 18650

Somebody requested a core with a spot for an 18650 battery and I figured it wouldn't be too hard since micwilli77 already had the core blank ready to go. Aside from my locking tab breaking off from the test print it fits great.

There's a tiny step inside where the battery sits as my intention is to have the battery fit positive side down but the battery fits in either orientation. My purple Efest fits nice and snug, can't find any of my other 18650s to test fitment of other wraps/rewraps. Should I come across them I'll test em and make modifications as necessary.