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First of all for all of you who dont know what a gun blow back is it is when the top half of a gun flys back when shot but we will be creating this digitally.
This is what we will be making...
Look closely at the top half of the gun. It flys back and then hits back in. This is what we will be creating
Okay I think this works on all fxhome software Effects Lab, Visionlab and Compositelab.
Im working on visionlab.
Okay so open up your software and import your footage of you shooting your gun. Now duplicate that layer.
Now the layer you just duplicated go to the part where you have shot, when the muzzle flahs comes out and cut everything else out so you only have that frame on the top layer.
Now on that frame make a grabage matte around the top half of the gun
Invert Shape: ON
Okay so now position the top half of the gun that you cut out 1/4 to the left so the gun looks longer on the left side and its hanging over.
Now go to grade and use a Blur Angle.
Have the angle upwards or position to the way your gun is pointing and have a blur of 15.
Thats about it now just render it and it looks great.