No, the Stormtroopers from Star Wars do not passed from laser guns to the M4. And that they carry models that remind us very much of the Sten, the MG42, to ... Look:
In this case it is only a M4 painted with camouflage pattern for snowy environments Kryptek: the yeti.
Kryptek is a brand that has developed a line of six different camouflage to suit different environments with great skill. It is a company created by soldiers who apply all their experience to design the best patterns.
Here are several examples of models painted with the white pattern of his repertoire the yeti: