My son liked the design on JP1's turret and wanted it for his Halo Megabloks.
Not much more to say. I simply added Lego fittings on the bottom and resized a touch.
Follow JP1's print settings etc.
Nice work JP1.
JP1 has created a better version of this to include a destroyed Turret conversion. It opens up all sorts of options. Find it here... http://www.thingiverse.com/make:178576