There are currently 2 issues as of right now
1) The foregrip is far too ahead of where it's supposed to be. Moving it back a few inches will fix this problem but for the most part, it's hidden by the T H I C C heister hands.
2) The reload animation is screwed as the magazine is chambered into the gun via the force (it's floating directly in front of the screen). My recommendation is to find someone to make a custom model specifically for this so that you can align the animations correctly to at least lessen or remove the issue.
I know it's kind of redundant getting this feedback and not technical information but just putting it out here so that people know exactly whats with this mod.
Note : Do not bother using this with Sydney as her tiny arms/hands will make the vertical foregrip visibly not be held. Use the other heisters to conceal the improper grip because their hands are the size of the moon.

For those that have problems with ADS(Aiming Down Sights)
Go use this mod - Luffy's Perfect View Model
https://modworkshop.net/mydownloads.php?action=view_down&did=17618
Press F7 to modify the "Steelsight" X,Y and Z variables so that you can align the ironsights properly.
The configuration I used is below 
(Note I was using custom ironsights, but this is as close as I can get to a clear sight picture with them.)
X = -9.210, Y = -9.996, Z = 1.700

Here is an up-to-date picture showing what the gun looks