Overclocker
Flashlight Enthusiast
So here's a quick and dirty comparison between the two. Both SMO. MT40 is newer and it's got a lot more modes so it must be better. Right?
Low mode:
If you were expecting the MT40 to have a PROPER low mode then you're in for a disappointment. They appear to be identical.
Max mode:
That was a reduced exposure to hopefully show some differences. MT40 is a tiny bit brighter. Side by side you won't notice any difference.
MT40 has a half-assed snap-on pocket clip. A light this size would require something a lot more robust, and that's assuming you've got a pocket deep enough to hold the MT40. On a belt the clip simply would not cut it.
MT40's strobe can't be permanently assigned to the head-loose position so it's useless, can't deploy it quickly, you need to scroll scroll scroll...
As I've mentioned the MT40 doesn't have a true low mode, therefore all the intermediate levels slot between the so-called LOW and the MAX. Not terribly useful in a light of this size. You'll be just fine with the BC40's two modes. Simple. No scrolling.
MT40 has just a SINGLE O-RING on the head so the head rotates way too easily and is kinda wobbly in the head-loose position. BC40 has double o-rings, a lot more stable.
BC40 tailstands more stably.
So there you have it, quick and dirty as advertised LOL