Newbie needs help with choosing flashlight

I have had some luck with the C series lights I built the C2 kit from DX but protected batteries don't fit in it.

https://budgetlightforum.com/t/-/2023

I bought a KDC8 that was nice than I bought a T-mart C8 the pill was hollow aluminum and the head was not completely machined to accept the standard C8 pill so unlike a lousy P60 host this thing was useless.

KDC8 pill left Tmart Ultrafire C8 pill right hollow junk

KDC8 head left fully machined Tmart Ultrafire C8 pill right machining

to accept standard C8 pill incomplete standard C8 pill wil not fit

The switch was absolute garbage on the Tmart /Ultrafire C8 also

In my opinion you really need to be careful with the C series lights stick with the KDC8.