STG44 has also zero recoil while having a much better rate of fire - so to speak MKB is in no way " easier to controll " considering you cant really get better than no recoil.
To be fair though, a accuracy nerf could be considered, since MKB fires with an open bolt unlike STG44. I think MKB deserves to be in BR4, from a settings perspective, and in general many BR5 weapons from all nations can move to BR4 aswell.
Some fine adjustments in the form of small nerfs shouldn’t be an issue.
I’m fine with moving the Mkb to BR IV
What I was saying was a terrible idea was Gastano’s suggestion to make the Mkb an all class weapon
I will have to disagree the M3a1 is the best change my mind.
If you are speaking of grease gun, that’s BR2 weapon.
…but its not BR 3 
Still far better and hits like a freight train I’ve used all the way up to rank V.
makes no difference to me its still 45 acp.
I want to like the 45s more than I do…but I prefer more velocity. 45s are “okay”
I’ve use the PPSH, Sten, Warchester, type 100 etc. they all lack stopping power and they don’t do it.
I like the STG but its far too good to be down tiered.
I use 30 cal Thompson or 50 round lanchester for BR 3 allies.
Only other SMGS I really use is silenced sten and Welgun
Silenced M3 is pretty good just have to get over the already slow bullet speed being slower.
Those 3 are on my BR 2 biker squad. no room for it at BR 3