[BUG] Some weapons contain misalignment problems

[Koud-Wind]

Version: [mw3.0-0.5.0.0]

Describe the bug
For me, I know some gun models or movement problems

wrong

1. The player's hand is not on the grip of P90 and origin12
   
   

2. Misalignment of accessories
   
   
   
   
   
   
   

Mislocation of bullets from sniper rifle, This happens to almost every sniper rifle

3. About M134 smoke dislocation, fire dislocation
   

4. Some guns cannot be equipped with grips in adventure mode (mw:s7_10_tricun)

Expected behavior
Correct position

Additional context
#27
#67