GUYS GUYS GUYS after almost 2 years of silace there was finally an update to the "new" beta (baconbacon01)
big corporation has finally added the blake gun aka granade luncher i have already made a guide how to unlock it
but short version is:
reach wave 8 in hordes mode
enter golem gogo's crypt
there will be a new key beside golem gogo's statue grabbing it will instantly unlock the blake gun and make it apear in the barn

remember it is only in the "new" beta dont try it in the curent version
if you have no idea what im talking about check this out: https://steamhost.cn/steamcommunity_com/app/434570/discussions/0/3816291531977569199/

if you want more in depth look into the new blake gun check out my guide:
https://www.youtube.com/watch?v=Ye7bIdEkCV0