the web site seems a bit messed up on my browser..
is this everything you need to fire it up, or do you need to buy more pieces?
it describes this as an upgrade kit for a surfire light rather than a complete light on it's own?
I don't see where it says anything about running on AAAs on the right where is show 18650 runtimes, ect..
Yes it fits Surefire bodies, also Solarforce bodies, they are all the same.
You get the 'Monster Thrower Head' bit of a joke name but a serious bit of kit, plus if you look on the left, it says under 'Product Name'...... Solarforce Masterpiece Pro-1 Turbo Head King ~ Monster Thrower + Free L2i AAA/18650/CR123A battery tube + switch x 1pc FREE !!
I ordered exactly this just for the head (I already had a body and tailswitch to fit) and it came with a (fattish) tube, a tailswitch and a battery cartridge that takes 3xAAAs
Now, the 'Masterpiece Pro-1 Turbo Head' is already acknowledged as a terrific thrower, with the free stuff, you add 3 AAAs for a total of 4.5 volts. The Catapult with one 18650 is 3.7 volts so there is no way it can be underpowered compared to one 18650.
You asked for a great thrower that takes alkalines and I believe this fits. The Masterpiece Pro-1 Turbo Head is a great bit of kit and it comes with all you need except batteries.
Of course, later on if you fancied an upgrade you could add the Solarforce 2x18650 tube and suitable tailswitch.