Hello, new to this type of flashlight. Looking to get a nice flashlight to mount on an AR15 rifle. It has to be bright, more flood than throw, and most importantly has to use 18650 batteries. Have about decided on the Olight M21, can get one for $90 shipped. Also have read some bad things on this forum about the anodizing not being durable so I am not so sure about this light. My question is are there any lights better than this that are cheaper than $90?