Check out this Convoy M1
As you can see in the pictures the pill unscrews from the body like the smaller "S" series.
But when you go look at reviews you are NOT sent a M1 with a removable pill...
Does anyone know where to get this exact model?
link: https://www.fasttech.com/products/0/10002463/1277400-convoy-m1-diy-edc-led-flashlight-host
I think you’re best bet would be to ask Simon if he has any of the older ones left.
Simon? is that a user here? need t0 be a little more specific bud 
Simon is our contact directly to Convoy.
You can PM him, username: convoy-flashlight
If you need only the host - I’ve bought mine from Banggood:
http://www.banggood.com/M1-Hard-Oxygen-LED-Flashlight-Shell-Host-18650-With-OP-Reflector-p-935424.html (old version with brass pill)
They offer also the new version (Convoy M1 NEUE Version DIY Integrierte Leiter LED Taschenlampe Host Sale - Banggood Deutschland-arrival notice-arrival notice)
therefore the first SKU should be the right one, at least end of January they send me the old model as ordered.
Nice find. I wish they had the M2 as well.