Originally Posted by Juke16
MP5Ks use V3 gear boxes, but I wouldn't trust the plastic on the Galaxies, my TM MP5K PDW did endure a winter game at -10 degrees last year though, just not the battery so be sure to get LiPos (I recommend the 7.4V LiPos from Hobby King).
MP5s uses a V2 (exactly the same as M4s) gearbox.
Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.